001 Retribution
001 Retribution
002 Shrunken Head
002 Shrunken Head
003 Notes in the Night
003 Notes in the Night
004 Death Has a Thirst
004 Death Has a Thirst
005 The Letter
005 The Letter
006 House of Greed
006 House of Greed
007 Mirage
007 Mirage
008 Fog
008 Fog
009 Jealousy
009 Jealousy
010 Urge to Kill
010 Urge to Kill
011 Malice
011 Malice
012 Death Comes at Midnight
012 Death Comes at Midnight
013 The Alibi
013 The Alibi
014 Apparition
014 Apparition
015 The Other Woman
015 The Other Woman
016 Avarice
016 Avarice
017 The Accounting
017 The Accounting
018 DoubleCross
018 DoubleCross
019 The Weakling
019 The Weakling
020 The Nemesis
020 The Nemesis
021 The Thief
021 The Thief
022 Mind over Matter
022 Mind over Matter
023 The Confession
023 The Confession
024 In the Dark
024 In the Dark
025 Legacy of Death
025 Legacy of Death
026 The Penalty
026 The Penalty
027 The Killers
027 The Killers
028 Death Has a Thirst
028 Death Has a Thirst
029 The Man Who Waited
029 The Man Who Waited
030 Shadow of a Mind
030 Shadow of a Mind
031 Justice
031 Justice
032 House of Fear
032 House of Fear
033 The Blank Wall
033 The Blank Wall
034 The Avengers
034 The Avengers
035 An Eye for an Eye
035 An Eye for an Eye
036 Death in the Air
036 Death in the Air
037 Destiny
037 Destiny
038 Tangled Web
038 Tangled Web
039 Blind Alley
039 Blind Alley
040 Mirage
040 Mirage
041 Patients for the Doctor
041 Patients for the Doctor
042 Death Demands a Payment
042 Death Demands a Payment
043 The Doctor Prescribes Death
043 The Doctor Prescribes Death
044 Last of the Devereaux
044 Last of the Devereaux
045 Till Death Do Us Part
045 Till Death Do Us Part
046 Practically Foolproof
046 Practically Foolproof
047 Local Storm
047 Local Storm
048 Black Magic
048 Black Magic
049 Married to Murder
049 Married to Murder
050 Not If I Kill You First
050 Not If I Kill You First
051 Finders Weepers
051 Finders Weepers
052 The Tale The Dead Man Told
052 The Tale The Dead Man Told
053 Death Carries A Lunch Kit
053 Death Carries A Lunch Kit
054 Death Carries a Lunch Kit
054 Death Carries a Lunch Kit
055 The Beloved Fraud
055 The Beloved Fraud
056 Beware the Bridegroom
056 Beware the Bridegroom
057 Death Sees Double
057 Death Sees Double
058 Death Walks a Tightwire
058 Death Walks a Tightwire
059 Doctor Operates in Crime
059 Doctor Operates in Crime
060 Lie or Consequences
060 Lie or Consequences
061 Windfall
061 Windfall
062 Christmas Bonus
062 Christmas Bonus
063 Two for the Money
063 Two for the Money
064 Murder Has a Signature
064 Murder Has a Signature
065 Seascape
065 Seascape
066 Murder on Paper
066 Murder on Paper
067 Murder Is Legal
067 Murder Is Legal
068 The Dead Man Laughed
068 The Dead Man Laughed
069 Murder Opens A Gate aka Gateway To Danger
069 Murder Opens A Gate aka Gateway To Danger
070 Danger Is a Beautiful Blond
070 Danger Is a Beautiful Blond
071 Death Marks the Double Cross (Mystery Theater Version)
071 Death Marks the Double Cross (Mystery Theater Version)
072 Murder Will Shout
072 Murder Will Shout
073 Return of the Innocent
073 Return of the Innocent
074 To Rent Danger
074 To Rent Danger
075 Meet Mr Death
075 Meet Mr Death
076 AccidentAccording to Plans
076 AccidentAccording to Plans
077 The Man Who Bought Death
077 The Man Who Bought Death
078 Escape to Danger
078 Escape to Danger
079 Murder Is Blind
079 Murder Is Blind
080 Death Pays a Visit
080 Death Pays a Visit
081 Blueprint for Suicide
081 Blueprint for Suicide
082 Death Watch
082 Death Watch
083 Deadly Innocent
083 Deadly Innocent
084 Highway of Escape
084 Highway of Escape
085 Pattern for Terror
085 Pattern for Terror
086 Let George Do It
086 Let George Do It
087 Summer Thunder
087 Summer Thunder
088 The Man Who Came to Murder
088 The Man Who Came to Murder
089 What Makes a Murderer
089 What Makes a Murderer
090 X Marks the Murderer
090 X Marks the Murderer
091 Ambition Perilous
091 Ambition Perilous
092 Phone Call from Death
092 Phone Call from Death
093 Sing a Song of Murder
093 Sing a Song of Murder
094 The Man Who Died Twice
094 The Man Who Died Twice
095 Death Wears a White Robe
095 Death Wears a White Robe
096 Death Laughs Last
096 Death Laughs Last
097 House on Sycamore Road
097 House on Sycamore Road
098 One Man Jury
098 One Man Jury
099 Final Return
099 Final Return
100 Harvest of Death
100 Harvest of Death
101 The Seeing Eye
101 The Seeing Eye
102 Coincidence
102 Coincidence
103 The Stray Dream
103 The Stray Dream
104 Poison Is Quicker
104 Poison Is Quicker
105 The Cistern
105 The Cistern
106 Lucky Night
106 Lucky Night
107 Miracle on 49th Street
107 Miracle on 49th Street
108 The Thin Line
108 The Thin Line
109 Hit and Run
109 Hit and Run
110 Treasure Hunt
110 Treasure Hunt
111 The Strange Sisters
111 The Strange Sisters
112 Panic
112 Panic
113 Six Letter Word for Death
113 Six Letter Word for Death
114 Murder in Haste
114 Murder in Haste
115 Whistler (196) Murder in Haste (AFRS)
115 Whistler (196) Murder in Haste (AFRS)
116 Decision
116 Decision
117 Boomerang
117 Boomerang
118 The Trigger Man
118 The Trigger Man
119 Three Times a Sinner
119 Three Times a Sinner
120 Terror Stricken
120 Terror Stricken
121 Smart Boy
121 Smart Boy
122 Waterford Case
122 Waterford Case
123 Bright Horizon
123 Bright Horizon
124 Broken Chain
124 Broken Chain
125 The Judas Face
125 The Judas Face
126 Quiet Sunday
126 Quiet Sunday
127 Affair at Stoney Ridge
127 Affair at Stoney Ridge
128 Blind Bet
128 Blind Bet
129 Solid Citizen
129 Solid Citizen
130 Confession
130 Confession
131 Custom Built Blond
131 Custom Built Blond
132 The SellOut
132 The SellOut
133 Bullet Proof
133 Bullet Proof
134 Stolen Murder
134 Stolen Murder
135 Delivery Guaranteed
135 Delivery Guaranteed
136 Broken Chain (East Coast Broadcast)
136 Broken Chain (East Coast Broadcast)
137 Stranger in the House
137 Stranger in the House
138 Witness at the Fountain
138 Witness at the Fountain
139 A Brief Pause For Murder (East Coast Broadcast)
139 A Brief Pause For Murder (East Coast Broadcast)
140 The Brass Ring
140 The Brass Ring
141 A Present for Ricky
141 A Present for Ricky
142 Weak Sister
142 Weak Sister
143 Masquerade
143 Masquerade
144 Backfire
144 Backfire
145 The Deadly Penny
145 The Deadly Penny
146 Two Year Plan
146 Two Year Plan
147 With My Own Eyes
147 With My Own Eyes
148 Next Year Is Mine
148 Next Year Is Mine
149 Murder on Rourke Island
149 Murder on Rourke Island
150 Dear Roger
150 Dear Roger
151 The Choice
151 The Choice
152 Last Curtain
152 Last Curtain
153 Night Melody
153 Night Melody
154 Seven Steps to Murder
154 Seven Steps to Murder
155 Safety in Numbers
155 Safety in Numbers
156 Seven Steps To Murder (East Coast Broadcast)
156 Seven Steps To Murder (East Coast Broadcast)
157 Eight to Twelve
157 Eight to Twelve
158 Blue Legend
158 Blue Legend
159 Murder of Byron Blake
159 Murder of Byron Blake
160 Mavis Cameron Disappears
160 Mavis Cameron Disappears
161 The Lady and the Knife
161 The Lady and the Knife
162 The Blank Wall
162 The Blank Wall
163 Maid of Honor
163 Maid of Honor
164 Backlash
164 Backlash
165 The Black Book
165 The Black Book
166 Windfall
166 Windfall
167 18 Bowden Lane
167 18 Bowden Lane
168 Hasty Conclusion
168 Hasty Conclusion
169 Fateful Friday
169 Fateful Friday
170 Juggernaut
170 Juggernaut
171 Ambassador of Death
171 Ambassador of Death
172 The Gentle Way
172 The Gentle Way
173 The Two Lives of Colby Fletcher
173 The Two Lives of Colby Fletcher
174 Beyond Reasonable Doubt
174 Beyond Reasonable Doubt
175 Borrowed Byline
175 Borrowed Byline
176 Dark Future
176 Dark Future
177 Whispered Verdict
177 Whispered Verdict
178 Girl Next Door
178 Girl Next Door
179 Curtain Call
179 Curtain Call
180 The Eleventh Hour
180 The Eleventh Hour
181 Bridge on Black Mountain
181 Bridge on Black Mountain
182 Sleep My Pretty One
182 Sleep My Pretty One
183 Career Man
183 Career Man
184 Man of Distinction
184 Man of Distinction
185 A Case for Mister Carrington
185 A Case for Mister Carrington
186 The Back Door
186 The Back Door
187 The Big Prison
187 The Big Prison
188 Dark Moon
188 Dark Moon
189 The Body Off Billingsgate
189 The Body Off Billingsgate
190 Wedding Gift
190 Wedding Gift
191 Murder in Haste
191 Murder in Haste
192 Decision
192 Decision
193 The First Year
193 The First Year
194 Comeback
194 Comeback
195 Silent Partner
195 Silent Partner
196 Twelve Portraits of Marcia
196 Twelve Portraits of Marcia
197 Night Final
197 Night Final
198 Undertow
198 Undertow
199 Money Is The Root Of All Evil
199 Money Is The Root Of All Evil
200 Quiet Suicide
200 Quiet Suicide
201 Meeting on Tenth Street
201 Meeting on Tenth Street
202 Boiling Point
202 Boiling Point
203 Return Engagement
203 Return Engagement
204 The Human Catalyst
204 The Human Catalyst
205 The Dark Room
205 The Dark Room
206 Bird of Prey
206 Bird of Prey
207 What Makes a Murderer
207 What Makes a Murderer
208 Till Death Do Us Part
208 Till Death Do Us Part
209 Silent City
209 Silent City
210 Tough Guy
210 Tough Guy
211 Chain Reaction
211 Chain Reaction
212 Murder on Margin
212 Murder on Margin
213 Stranger in the House
213 Stranger in the House
214 Concerto of Death
214 Concerto of Death
215 Small Town Girl
215 Small Town Girl
216 Fatal Appointment
216 Fatal Appointment
217 Farewell Party
217 Farewell Party
218 Lady from the Sea
218 Lady from the Sea
219 Question of Murder
219 Question of Murder
220 Enough Rope
220 Enough Rope
221 Bright Future
221 Bright Future
222 Trio of Rogues
222 Trio of Rogues
223 Payment in Full
223 Payment in Full
224 Still Death
224 Still Death
225 Conspiracy
225 Conspiracy
226 Big Gamble
226 Big Gamble
227 Whirlpool
227 Whirlpool
228 Package for Emily
228 Package for Emily
229 Search for an Unknown
229 Search for an Unknown
230 Letter from Yesterday
230 Letter from Yesterday
231 Cover Up
231 Cover Up
232 Nightmare
232 Nightmare
233 The Lovely Look
233 The Lovely Look
234 Murder in Paradise
234 Murder in Paradise
235 Hired Alibi
235 Hired Alibi
236 Stormy Weather
236 Stormy Weather
237 The Hangtree Affair
237 The Hangtree Affair
238 Delayed Christmas Present
238 Delayed Christmas Present
239 Man on the Roof
239 Man on the Roof
240 Tell Tale Brand
240 Tell Tale Brand
241 Shakedown
241 Shakedown
242 Impulse
242 Impulse
243 All Damage Covered
243 All Damage Covered
244 The Cheat
244 The Cheat
245 The Cheat
245 The Cheat
246 Last Curtain
246 Last Curtain
247 Ticket to Paris
247 Ticket to Paris
248 Grave Secret
248 Grave Secret
249 Grave Secret
249 Grave Secret
250 Search for Maxine
250 Search for Maxine
251 Death of Mr Penny
251 Death of Mr Penny
252 Death of Mr Penny
252 Death of Mr Penny
253 Beyond the Wall
253 Beyond the Wall
254 Beyond the Wall
254 Beyond the Wall
255 The Rawhide Coffin
255 The Rawhide Coffin
256 Murder at Twin Pines
256 Murder at Twin Pines
257 Sleep My Pretty One
257 Sleep My Pretty One
258 A Mask for Kinsella
258 A Mask for Kinsella
259 Solid Citizen
259 Solid Citizen
260 Solid Citizen
260 Solid Citizen
261 Danger Is a Beautiful Blond
261 Danger Is a Beautiful Blond
262 Golden Opportunity
262 Golden Opportunity
263 Fatal Fraud
263 Fatal Fraud
264 Deal with Death
264 Deal with Death
265 Letter to Melanie
265 Letter to Melanie
266 Perfect Alibi
266 Perfect Alibi
267 That Physical Fact
267 That Physical Fact
268 Final Decree
268 Final Decree
269 Panic on Mulberry Street
269 Panic on Mulberry Street
270 Front Man
270 Front Man
271 Front Man
271 Front Man
272 Death in Sixteen Millimeter
272 Death in Sixteen Millimeter
273 Death in Sixteen Millimeter
273 Death in Sixteen Millimeter
274 The Hermit
274 The Hermit
275 Brotherly Hate
275 Brotherly Hate
276 The Trigger Man
276 The Trigger Man
277 Best Friend
277 Best Friend
278 The Confession
278 The Confession
279 The Eager Pigeon
279 The Eager Pigeon
280 Smart Girl
280 Smart Girl
281 Brief Pause for Murder
281 Brief Pause for Murder
282 Poor Henry
282 Poor Henry
283 Incident at Arroyo Grande
283 Incident at Arroyo Grande
284 A Rose For Pamela
284 A Rose For Pamela
285 Best Man
285 Best Man
286 Debt of Honor
286 Debt of Honor
287 Ticket to Murder
287 Ticket to Murder
288 The New Mrs Devlin
288 The New Mrs Devlin
289 Incident at Pebble Cove
289 Incident at Pebble Cove
290 Letters from Aaron Burr
290 Letters from Aaron Burr
291 Clever Mister Farley
291 Clever Mister Farley
292 Impulse
292 Impulse
293 Swan Song
293 Swan Song
294 Patroness of Murder
294 Patroness of Murder
295 Letter from Cynthia
295 Letter from Cynthia
296 Evening Stroll
296 Evening Stroll
297 Return to Riondo
297 Return to Riondo
298 Escape to Skull Island
298 Escape to Skull Island
299 The GoBetween
299 The GoBetween
300 Burden of Guilt
300 Burden of Guilt
301 Desert Reckoning
301 Desert Reckoning
302 Five Cent Call
302 Five Cent Call
303 Appointment for Murder
303 Appointment for Murder
304 Chinese Elephant Puzzle
304 Chinese Elephant Puzzle
305 The Chinese Elephant Puzzle
305 The Chinese Elephant Puzzle
306 Strange Meeting
306 Strange Meeting
307 Oriana Affair
307 Oriana Affair
308 Lady in the Snow
308 Lady in the Snow
309 Lady with a Key
309 Lady with a Key
310 Dark Voyage
310 Dark Voyage
311 Murder in Mind
311 Murder in Mind
312 Return with the Spray
312 Return with the Spray
313 Gratitude
313 Gratitude
314 Fatal Error
314 Fatal Error
315 Blue Alibi
315 Blue Alibi
316 Blue Alibi
316 Blue Alibi
317 The Return
317 The Return
318 Rebound
318 Rebound
319 Jessica
319 Jessica
320 Manhunt
320 Manhunt
321 Quiet Sunday
321 Quiet Sunday
322 Devoted Couple
322 Devoted Couple
323 Attorney for the Defense
323 Attorney for the Defense
324 Attorney for the Defense
324 Attorney for the Defense
325 The Cliffs at Weyrum
325 The Cliffs at Weyrum
326 With My Own Eyes
326 With My Own Eyes
327 Double Exposure
327 Double Exposure
328 Finale
328 Finale
329 Undercurrent
329 Undercurrent
330 Whirlwind
330 Whirlwind
331 Golden Penny
331 Golden Penny
332 Deadly Rumor
332 Deadly Rumor
333 That Hemsley Affair
333 That Hemsley Affair
334 Dear Diary
334 Dear Diary
335 Fatal Action
335 Fatal Action
336 Fatal Action
336 Fatal Action
337 Smart Boy
337 Smart Boy
338 The Wall
338 The Wall
339 The Intruder
339 The Intruder
340 Just Like a Man
340 Just Like a Man
341 A Friendly Case of Blackmail aka Hit And Run
341 A Friendly Case of Blackmail aka Hit And Run
342 Warm Reception
342 Warm Reception
343 Till Death Do Us Part
343 Till Death Do Us Part
344 The Lady With the Knife
344 The Lady With the Knife
345 Clock on the Tower
345 Clock on the Tower
346 Flee from Evil
346 Flee from Evil
347 Three Wise Guys
347 Three Wise Guys
348 The Big Jump
348 The Big Jump
349 Hit and Run
349 Hit and Run
350 The Little Things
350 The Little Things
351 Treasure Hunt
351 Treasure Hunt
352 Trade Mark
352 Trade Mark
353 Murder over Burma
353 Murder over Burma
354 Spell in Green
354 Spell in Green
355 Man in the Storm
355 Man in the Storm
356 Murder Arrangement
356 Murder Arrangement
357 Helping Hand
357 Helping Hand
358 High Death
358 High Death
359 Jackson Street Affair
359 Jackson Street Affair
360 His Own Reward
360 His Own Reward
361 Man in a Corner
361 Man in a Corner
362 Triple Cross
362 Triple Cross
363 Kind Thought
363 Kind Thought
364 Clayton Affair
364 Clayton Affair
365 Two and One Makes Murder
365 Two and One Makes Murder
366 A Matter of Courtesy
366 A Matter of Courtesy
367 CustomMade Murder
367 CustomMade Murder
368 Seattle Take Three
368 Seattle Take Three
369 Tall Thin Man
369 Tall Thin Man
370 Law of Physics
370 Law of Physics
371 The Man in the Trench Coat
371 The Man in the Trench Coat
372 Murder of Byron Blake
372 Murder of Byron Blake
373 The House on Hainsley Boulevard
373 The House on Hainsley Boulevard
374 The Witness
374 The Witness
375 Autumn Song
375 Autumn Song
376 Danger Is a Beautiful Blond
376 Danger Is a Beautiful Blond
377 Design for Murder
377 Design for Murder
378 Fateful Reminder
378 Fateful Reminder
379 She Never Would Be Missed
379 She Never Would Be Missed
380 Public Hero
380 Public Hero
381 Guilty Conscience
381 Guilty Conscience
382 A Matter of Patience
382 A Matter of Patience
383 Two Smart People
383 Two Smart People
384 Partners in Crime
384 Partners in Crime
385 Alias Mister Alden
385 Alias Mister Alden
386 Man on the Run
386 Man on the Run
387 Three Minus One Equals Murder
387 Three Minus One Equals Murder
388 The Clay Tree
388 The Clay Tree
389 End of the Road
389 End of the Road
390 The Other Hand
390 The Other Hand
391 Curiosity Killed the Cat
391 Curiosity Killed the Cat
392 Christmas Gift
392 Christmas Gift
393 Fatal Step
393 Fatal Step
394 Episode at Thunder Mountain
394 Episode at Thunder Mountain
395 Bad Penny
395 Bad Penny
396 Borrowed Byline
396 Borrowed Byline
397 Borrowed Byline
397 Borrowed Byline
398 Shakedown
398 Shakedown
399 Little Red Book
399 Little Red Book
400 Rose for Pamela
400 Rose for Pamela
401 A Matter of Time
401 A Matter of Time
402 A Matter of Time
402 A Matter of Time
403 Whirlpool
403 Whirlpool
404 Breakaway
404 Breakaway
405 Marked Man
405 Marked Man
406 Ski Master
406 Ski Master
407 Homecoming
407 Homecoming
408 Element X
408 Element X
409 Saturday Night
409 Saturday Night
410 Lady In Waiting
410 Lady In Waiting
411 A Matter of Odds
411 A Matter of Odds
412 Determined Traveler
412 Determined Traveler
413 Charming Hostess
413 Charming Hostess
414 Man in the Way
414 Man in the Way
415 Last Message
415 Last Message
416 Night Flight
416 Night Flight
417 Triple Play
417 Triple Play
418 Dark Island
418 Dark Island
419 Final Papers
419 Final Papers
420 The Secret of Chalk Point
420 The Secret of Chalk Point
421 One Dark Night
421 One Dark Night
422 The Prosecutor
422 The Prosecutor
423 The Calculator
423 The Calculator
424 So Soon
424 So Soon
425 Christmas Bonus
425 Christmas Bonus
426 The Disappearing Woman
426 The Disappearing Woman
427 Glass Dime
427 Glass Dime
428 Silver Service
428 Silver Service
429 Death Claim
429 Death Claim
430 Ticket to Nowhere
430 Ticket to Nowhere
431 Girl in Black
431 Girl in Black
432 Impulse
432 Impulse
433 Fading Star
433 Fading Star
434 Perilous Meeting
434 Perilous Meeting
435 Lady on a Yacht
435 Lady on a Yacht
436 Generous Host
436 Generous Host
437 The Huntress
437 The Huntress
438 Lonely Highway
438 Lonely Highway
439 Fatal Fraud
439 Fatal Fraud
440 Dance Team
440 Dance Team
441 Man from Calais
441 Man from Calais
442 Feature Story
442 Feature Story
443 Hudson Bay Incident
443 Hudson Bay Incident
444 Escape to Doom
444 Escape to Doom
445 Perilous Weekend
445 Perilous Weekend
446 Days Of Fear
446 Days Of Fear
447 Spell in Green
447 Spell in Green
448 Gentlemen from Oxford
448 Gentlemen from Oxford
449 She Wanted Too Much
449 She Wanted Too Much
450 That Cutlerville Affair
450 That Cutlerville Affair
451 Round Trip Tickets
451 Round Trip Tickets
452 Dark Pattern
452 Dark Pattern
453 Anything for a Friend
453 Anything for a Friend
454 Borrowed Future
454 Borrowed Future
455 Traveling Companion
455 Traveling Companion
456 Quadrangle
456 Quadrangle
457 Song Team
457 Song Team
458 Stolen Letter
458 Stolen Letter
459 Last Request
459 Last Request
460 The Prosecutor
460 The Prosecutor
461 One Dark Night
461 One Dark Night
462 Whirlpool
462 Whirlpool
463 Element X
463 Element X
464 Undercurrent
464 Undercurrent
465 Bright Boy
465 Bright Boy
466 The Alibi
466 The Alibi
467 Seven Steps to Murder
467 Seven Steps to Murder
468 Backfire
468 Backfire
469 The Ambassador
469 The Ambassador
470 Incident at Chalk Point
470 Incident at Chalk Point
471 Letters from Aaron Burr
471 Letters from Aaron Burr
472 The Lovely Look
472 The Lovely Look
473 Night Melody
473 Night Melody
474 A Case for Mister Carrington
474 A Case for Mister Carrington
475 The First Year
475 The First Year
476 Lady in Waiting
476 Lady in Waiting
477 The Big Prison
477 The Big Prison
478 The Havana Lee
478 The Havana Lee
479 Marked Man
479 Marked Man
480 A Present for Ricky
480 A Present for Ricky
481 Little Red Book
481 Little Red Book
482 Design for Murder
482 Design for Murder
The Whistler is an American radio mystery drama which ran from May 16, 1942, until September 22, 1955, on the west-coast regional CBS radio network. The show was also broadcast in Chicago and over Armed Forces Radio. On the west coast, it was sponsored by the Signal Oil Company: “That whistle is your signal for the Signal Oil program, The Whistler.” There were also two short-lived attempts to form east-coast broadcast spurs: July 3 to September 25, 1946, sponsored by the Campbell Soup Company; and March 26, 1947, to September 29, 1948, sponsored by Household Finance. The program was also adapted into a film noir series by Columbia Pictures in 1944. – from Wikipedia