Mr. Keen, Tracer of Lost Persons

June 11, 1940 to June 25, 1954
550 episodes known to exist
Mr. Keen, Tracer of Lost Persons was one of radio's longest running shows, airing (October 12, 1937 to April 19, 1955), continuing well into the television era. It was produced by Frank and Anne Hummert. The sponsors included Whitehall Pharmacal (as in Anacin, Kolynos Toothpaste, BiSoDol antacid mints, Hill's cold tablets and Heet liniment), Dentyne, Aerowax, RCA Victor and Chesterfield cigarettes. It aired on the NBC Blue network until 1947, when it switched to CBS. More on Wikipedia
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Runs
Radio series often ran for multiple seasons and/or through many incarnations with different radio networks, sponsors, cast/crew, and revivals after many years.
#
Dates
Show
# Episodes (Known)
Network
1
June 11, 1940 - May 13, 1941
Mr. Keen, Tracer of Lost Persons
2
-
2
December 2, 1943 - June 18, 1954
Mr. Keen, Tracer of Lost Persons
544
-
3
June 21, 1954 - June 25, 1954
Mr. Keen, Tracer of Lost Persons
4
-
Mr. Keen, Tracer of Lost Persons
June 11, 1940 - May 13, 1941
2 episodes known to exist
#
Air Date
Title
Comments
Length
Sources
 
June 11, 1940 
The Case of the Missing Doll Part 4 
 
13:00 

 
 
May 13, 1941 
The Young Husband Who Thought His Wife Failed Him 
 
15:00 

 
Mr. Keen, Tracer of Lost Persons
December 2, 1943 - June 18, 1954
544 episodes known to exist
#
Air Date
Title
Comments
Length
Sources
December 2, 1943 
?? Title Unknown ?? 
 
30:00 

 
December 9, 1943 
?? Title Unknown ?? 
 
30:00 

 
December 16, 1943 
?? Title Unknown ?? 
 
30:00 

 
December 23, 1943 
?? Title Unknown ?? 
 
30:00 

 
December 30, 1943 
?? Title Unknown ?? 
 
30:00 

 
January 6, 1944 
The Case of the Moonless Night 
 
25:00 

 
January 13, 1944 
The Case of the Missing Witness 
 
25:00 

 
January 20, 1944 
The Case of the Girl Who Sang Too Well 
 
25:00 

 
January 27, 1944 
Man Who Didn't Come Home 
 
30:00 

 
10 
February 3, 1944 
The Case of the Girl Who Flirted 
 
25:00 

 
11 
February 10, 1944 
The Case of the Boy Who Used Big Words 
 
25:00 

 
12 
February 17, 1944 
The Case of Mr. Treavor's Secret 
 
25:00 

 
13 
February 24, 1944 
The Case of Murder in the Air 
 
25:00 

 
14 
March 2, 1944 
Lady Who Didn't Want to Be Found 
 
30:00 

 
15 
March 9, 1944 
?? Title Unknown ?? 
 
30:00 

 
16 
March 16, 1944 
The Case of the Strange Display 
 
25:00 

 
17 
March 23, 1944 
Room That Vanished 
 
30:00 

 
18 
March 30, 1944 
?? Title Unknown ?? 
 
30:00 

 
19 
April 6, 1944 
?? Title Unknown ?? 
 
30:00 

 
20 
April 13, 1944 
The Case of the Leaping Dog 
 
25:00 

 
21 
April 20, 1944 
Little Black Book 
 
30:00 

 
22 
April 27, 1944 
?? Title Unknown ?? 
 
30:00 

 
23 
May 4, 1944 
?? Title Unknown ?? 
 
30:00 

 
24 
May 11, 1944 
?? Title Unknown ?? 
 
30:00 

 
25 
May 18, 1944 
?? Title Unknown ?? 
 
30:00 

 
26 
May 25, 1944 
?? Title Unknown ?? 
 
30:00 

 
27 
June 1, 1944 
?? Title Unknown ?? 
 
30:00 

 
28 
June 8, 1944 
?? Title Unknown ?? 
 
30:00 

 
28 
June 15, 1944 
The Case of the Woman in Blue 
 
25:00 

 
30 
June 22, 1944 
Hidden Motive 
 
30:00 

 
31 
June 29, 1944 
?? Title Unknown ?? 
 
30:00 

 
32 
July 6, 1944 
?? Title Unknown ?? 
 
30:00 

 
33 
July 13, 1944 
?? Title Unknown ?? 
 
30:00 

 
34 
July 20, 1944 
?? Title Unknown ?? 
 
30:00 

 
35 
July 27, 1944 
?? Title Unknown ?? 
 
30:00 

 
36 
August 3, 1944 
?? Title Unknown ?? 
 
30:00 

 
37 
August 10, 1944 
?? Title Unknown ?? 
 
30:00 

 
38 
August 17, 1944 
?? Title Unknown ?? 
 
30:00 

 
39 
August 24, 1944 
?? Title Unknown ?? 
 
30:00 

 
40 
August 31, 1944 
?? Title Unknown ?? 
 
30:00 

 
42 
September 7, 1944 
Voices From the Past 
 
30:00 

 
43 
September 14, 1944 
Siamese Cat 
 
30:00 

 
44 
September 21, 1944 
Painted Horse 
 
30:00 

 
45 
September 28, 1944 
Landlocked Sailor 
 
30:00 

 
46 
October 5, 1944 
Missing Motive 
 
30:00 

 
47 
October 12, 1944 
Man Who Sent Flowers 
 
30:00 

 
48 
October 19, 1944 
Jeweled Hat Pin 
 
30:00 

 
49 
October 26, 1944 
Marked Hand 
 
30:00 

 
50 
November 2, 1944 
Loaded Suitcase 
 
30:00 

 
51 
November 9, 1944 
Girl and the Lost Violin 
 
30:00 

 
52 
November 16, 1944 
The Case of the Frightened Child 
 
25:00 

 
53 
November 23, 1944 
Two Strange and Beautiful Sisters 
 
30:00 

 
54 
November 30, 1944 
Stone That Was Worth a Fortune 
 
30:00 

 
55 
December 7, 1944 
The Strange Case of the Guilty Woman 
 
30:00 

 
56 
December 14, 1944 
The Nightmare Murder Case 
 
25:00 

 
57 
December 21, 1944 
Rainbow Butterfly 
 
30:00 

 
58 
December 28, 1944 
Man Who Wanted to Murder 
 
30:00 

 
59 
January 4, 1945 
Guilty Conscience 
 
30:00 

 
60 
January 11, 1945 
Mr Keen Takes a Partner 
 
30:00 

 
61 
January 18, 1945 
Barber Shop Quartet 
 
30:00 

 
62 
January 25, 1945 
Death Train 
 
30:00 

 
63 
February 1, 1945 
Evil Spirit 
 
30:00 

 
64 
February 8, 1945 
Corpse That Talked 
 
30:00 

 
65 
February 15, 1945 
Man in the Tower 
 
30:00 

 
66 
February 22, 1945 
Music Box That Wouldn't Quit Playing 
 
30:00 

 
67 
March 1, 1945 
Cross-Eyed Cat 
 
30:00 

 
68 
March 8, 1945 
Hidden Voice 
 
30:00 

 
69 
March 15, 1945 
The Case of the Absent Minded Professor 
 
25:00 

 
70 
March 22, 1945 
Bloodstained Piece of Tin 
 
30:00 

 
71 
March 29, 1945 
Girl At the Switchboard 
 
30:00 

 
72 
April 5, 1945 
Walking Corpse 
 
30:00 

 
73 
April 12, 1945 
?? Title Unknown ?? 
 
30:00 

 
74 
April 19, 1945 
Dangerous Wedding 
 
30:00 

 
75 
April 26, 1945 
?? Title Unknown ?? 
 
30:00 

 
76 
May 3, 1945 
Man with the Scar 
 
30:00 

 
77 
May 10, 1945 
House On Washington Square 
 
30:00 

 
78 
May 17, 1945 
The Foot Light Murder Case 
 
30:00 

 
79 
May 24, 1945 
Black Sheep 
 
30:00 

 
80 
May 31, 1945 
Missing Shoes 
 
30:00 

 
81 
June 7, 1945 
Room 501 
 
30:00 

 
82 
June 14, 1945 
20,000 Alibis 
 
30:00 

 
83 
June 21, 1945 
Missing Spectacles 
 
30:00 

 
84 
June 28, 1945 
Lonely Road 
 
30:00 

 
85 
July 5, 1945 
Murder On the Beach 
 
30:00 

 
86 
July 12, 1945 
?? Title Unknown ?? 
 
30:00 

 
87 
July 19, 1945 
?? Title Unknown ?? 
 
30:00 

 
88 
July 26, 1945 
?? Title Unknown ?? 
 
30:00 

 
89 
August 2, 1945 
?? Title Unknown ?? 
 
30:00 

 
90 
August 9, 1945 
?? Title Unknown ?? 
 
30:00 

 
91 
August 16, 1945 
?? Title Unknown ?? 
 
30:00 

 
92 
August 23, 1945 
?? Title Unknown ?? 
 
30:00 

 
93 
August 30, 1945 
?? Title Unknown ?? 
 
30:00 

 
94 
September 6, 1945 
The Amazing Case of the Broadway Columnist 
 
30:00 

 
95 
September 13, 1945 
Murder by Candlelight 
 
30:00 

 
96 
September 20, 1945 
Necktie Murders 
 
30:00 

 
97 
September 27, 1945 
The Weird Case of the Girl Named Ethel 
 
30:00 

 
98 
October 4, 1945 
Smiling Corpse 
 
30:00 

 
99 
October 11, 1945 
Hidden Room 
 
30:00 

 
100 
October 18, 1945 
Perfect Murder 
 
30:00 

 
101 
October 25, 1945 
Jealous Sister 
 
30:00 

 
102 
November 1, 1945 
The Strange Case of Anna Norton 
 
30:00 

 
103 
November 8, 1945 
Man with the Twisted Mouth 
 
30:00 

 
104 
November 15, 1945 
Missing Bridegroom 
 
30:00 

 
105 
November 22, 1945 
Daring Young Man On the Flying Trapeze 
 
30:00 

 
106 
November 29, 1945 
The Strange Case of Charley Lorimer 
 
27:41 

 
107 
December 6, 1945 
The Ballet Murder Case 
 
30:00 

 
108 
December 13, 1945 
The Weird Case of the Tolling Bell 
 
30:00 

 
109 
December 20, 1945 
Man Who Confessed 
 
30:00 

 
110 
December 27, 1945 
Forecast of Death 
 
30:00 

 
111 
January 3, 1946 
The Sinister Case of the Talking Bird 
 
30:00 

 
112 
January 10, 1946 
Disappearing Corpse 
 
30:00 

 
113 
January 17, 1946 
The Strange Case of the Sound of Death 
 
30:00 

 
114 
January 24, 1946 
The Strange Case of the Bald Headed Man 
 
30:00 

 
115 
January 31, 1946 
Lonely Road 
 
30:00 

 
116 
February 7, 1946 
Murdered Bride 
 
30:00 

 
117 
February 14, 1946 
The Strange Case of Nancy Rodgers 
 
30:00 

 
118 
February 21, 1946 
The Amazing Case of the Shrunken Head 
 
30:00 

 
119 
February 28, 1946 
Scarborough Murders 
 
30:00 

 
120 
March 7, 1946 
Golden Palm 
 
30:00 

 
121 
March 14, 1946 
Twisted Ring 
 
30:00 

 
122 
March 21, 1946 
Candid Cameraman 
 
30:00 

 
123 
March 28, 1946 
Blackstone Mansion 
 
30:00 

 
124 
April 4, 1946 
Poisoned Quill 
 
30:00 

 
125 
April 11, 1946 
Talking Mummy 
 
30:00 

 
126 
April 18, 1946 
Runaway Horse 
 
30:00 

 
127 
April 25, 1946 
The Sinister Case of the Wandering Singer 
 
30:00 

 
128 
May 2, 1946 
Sea Cove Strangler 
 
30:00 

 
129 
May 9, 1946 
Fabulous Necklace 
 
30:00 

 
130 
May 16, 1946 
Death in the Park 
 
30:00 

 
131 
May 23, 1946 
The Case of the Glamorous Widow 
 
25:00 

 
132 
May 30, 1946 
Golden Scorpion 
 
30:00 

 
133 
June 6, 1946 
House of Death 
 
30:00 

 
134 
June 13, 1946 
The Tragic Case of the Chiming Watch 
 
30:00 

 
135 
June 20, 1946 
Unfinished Portrait 
 
30:00 

 
136 
June 27, 1946 
Stuffed Kangaroo 
 
30:00 

 
137 
July 4, 1946 
Whimpering Dog 
 
30:00 

 
138 
July 11, 1946 
Phantom Killer 
 
30:00 

 
139 
July 18, 1946 
Scar-Faced Stoker 
 
30:00 

 
140 
July 25, 1946 
The Weird Case of the Roaring Lion 
 
30:00 

 
141 
August 1, 1946 
Straw-Hat Murder 
 
30:00 

 
142 
August 8, 1946 
Fatal Ruby 
 
30:00 

 
143 
August 15, 1946 
Sinister Room 
 
30:00 

 
144 
August 22, 1946 
Mapleton Murder 
 
30:00 

 
145 
August 29, 1946 
Prelude to Death 
 
30:00 

 
146 
September 5, 1946 
Pinpoint Murder 
 
30:00 

 
147 
September 12, 1946 
Yellow Envelope 
 
30:00 

 
148 
September 19, 1946 
Leaping Shark 
 
30:00 

 
149 
September 26, 1946 
Great Montclair 
 
30:00 

 
150 
October 3, 1946 
Vanishing Strangler 
 
30:00 

 
151 
October 10, 1946 
Man Who Repented 
 
30:00 

 
152 
October 17, 1946 
The Sedan Murder Case 
 
30:00 

 
153 
October 24, 1946 
Crowded Cemetery 
 
30:00 

 
154 
October 31, 1946 
?? Title Unknown ?? 
 
30:00 

 
155 
November 7, 1946 
Corpse Who Struck Back 
 
30:00 

 
156 
November 14, 1946 
White Carnation Murder 
 
30:00 

 
157 
November 21, 1946 
Bloodstained Calendar 
 
30:00 

 
158 
November 28, 1946 
Murder Mansion 
 
30:00 

 
159 
December 5, 1946 
Missing Teacup 
 
30:00 

 
160 
December 12, 1946 
Wife Who Dreamed of Murder 
 
30:00 

 
161 
December 19, 1946 
Lead-Lined Capsule 
 
30:00 

 
162 
December 26, 1946 
Murder and the Double Mystery 
 
30:00 

 
163 
January 2, 1947 
Telephone That Would Not Stop Ringing 
 
30:00 

 
164 
January 9, 1947 
Goat Woman 
 
30:00 

 
165 
January 16, 1947 
Walking Death 
 
30:00 

 
166 
January 23, 1947 
Phantom Bugler 
 
30:00 

 
167 
January 30, 1947 
The Good Samaritan Murder Case 
 
30:00 

 
168 
February 6, 1947 
Velvet Park Jewel Murder 
 
30:00 

 
169 
February 13, 1947 
Ghost of Anita Marlowe 
 
30:00 

 
170 
February 20, 1947 
The Weird Case of the Glass-Topped Coffin 
 
30:00 

 
171 
February 27, 1947 
The Weird Case of the Gulf Stream Horror 
 
30:00 

 
172 
March 6, 1947 
The Enoch Arden Murder Case 
 
30:00 

 
173 
March 13, 1947 
Hidden Corpse 
 
30:00 

 
174 
March 20, 1947 
The Weird Case of William Hunter 
 
30:00 

 
175 
March 27, 1947 
Bloodstained Bookmark 
 
30:00 

 
176 
April 3, 1947 
Jealous Husband 
 
30:00 

 
177 
April 10, 1947 
Faded Sapphire 
 
30:00 

 
178 
April 17, 1947 
The Terrifying Case of the Riderless Horse 
 
30:00 

 
179 
April 24, 1947 
The Terrifying Case of the Unhappy Bridegroom 
 
30:00 

 
180 
May 1, 1947 
Man Who Was Killed Twice 
 
30:00 

 
181 
May 8, 1947 
Living Dead 
 
30:00 

 
182 
May 15, 1947 
Beckoning Voices 
 
30:00 

 
183 
May 22, 1947 
Murder and the Mental Marvel 
 
30:00 

 
184 
May 29, 1947 
Bargain For Murder 
 
30:00 

 
185 
June 5, 1947 
Flower of Death 
 
30:00 

 
186 
June 12, 1947 
Iron Lady 
 
30:00 

 
187 
June 19, 1947 
Poisoned Glass 
 
30:00 

 
188 
June 26, 1947 
Park Drive Murders 
 
30:00 

 
189 
August 28, 1947 
Man Who Traveled with Death 
 
30:00 

 
190 
September 4, 1947 
Hat Pin Murders 
 
30:00 

 
191 
September 11, 1947 
The Auction Sale Murder Case 
 
30:00 

 
192 
September 18, 1947 
Perpetual Widow 
 
30:00 

 
193 
September 25, 1947 
The Spiny Ridge Murder Case 
 
30:00 

 
194 
October 2, 1947 
Bloodstained Nail File 
 
30:00 

 
195 
October 9, 1947 
The Sinister Case of the Yellow Roses 
 
30:00 

 
196 
October 16, 1947 
Talking Corpse 
 
30:00 

 
197 
October 23, 1947 
Appointment with Death 
 
30:00 

 
198 
October 30, 1947 
Teletype Murder 
 
30:00 

 
199 
November 6, 1947 
The Crossword Murder Case 
 
30:00 

 
200 
November 13, 1947 
Bulletproof Vest 
 
30:00 

 
201 
November 20, 1947 
Poisoned Well 
 
30:00 

 
202 
November 27, 1947 
The Ferryboat Murder Case 
 
30:00 

 
203 
December 4, 1947 
?? Title Unknown ?? 
 
30:00 

 
204 
December 11, 1947 
Murdered Author 
 
30:00 

 
205 
December 18, 1947 
Spider Killer 
 
30:00 

 
206 
December 25, 1947 
The Strange Case of the Christmas Bells 
 
30:00 

 
207 
January 1, 1948 
Tin Pan Alley Killing 
 
30:00 

 
208 
January 8, 1948 
Broken Glass 
 
30:00 

 
209 
January 15, 1948 
Man Who Was Buried 
 
30:00 

 
210 
January 22, 1948 
Frozen Body Murder 
 
30:00 

 
211 
January 29, 1948 
Creeping Death 
 
30:00 

 
212 
February 5, 1948 
The Double Death Murder Case 
 
30:00 

 
213 
February 12, 1948 
The Weird Case of Death and the Shoplifter 
 
30:00 

 
214 
February 19, 1948 
Vanishing Murderer 
 
30:00 

 
215 
February 26, 1948 
Dripping Candlestick 
 
30:00 

 
216 
March 4, 1948 
Picture of Death 
 
30:00 

 
217 
March 11, 1948 
Secret Murder 
 
30:00 

 
218 
March 18, 1948 
Terror over the Phone 
 
30:00 

 
219 
March 25, 1948 
Emerald of Death 
 
30:00 

 
220 
April 1, 1948 
Death Train 
 
30:00 

 
221 
April 8, 1948 
Deadly Perfume 
 
30:00 

 
222 
April 15, 1948 
Broken Mirror 
 
30:00 

 
223 
April 22, 1948 
Murder and the Sharp Scissors 
 
30:00 

 
224 
April 29, 1948 
Rehearsal of Death 
 
30:00 

 
225 
May 6, 1948 
Motion Picture Murder 
 
30:00 

 
226 
May 13, 1948 
Murder On a May Afternoon 
 
30:00 

 
227 
May 20, 1948 
Letter of Death 
 
30:00 

 
228 
May 27, 1948 
Elephant Gun Murder 
 
30:00 

 
229 
June 3, 1948 
Murder in Room Three Twenty Seven 
 
30:00 

 
230 
June 10, 1948 
Omen of Death 
 
30:00 

 
231 
June 17, 1948 
Murder Monster 
 
30:00 

 
232 
June 24, 1948 
Murder in the House of Horrors 
 
30:00 

 
233 
July 1, 1948 
Prophecy of Death 
 
30:00 

 
234 
July 8, 1948 
Murder in the Zoo 
 
30:00 

 
235 
July 15, 1948 
Death and the Weird Music 
 
30:00 

 
236 
July 22, 1948 
Murder, Old and New 
 
30:00 

 
237 
July 29, 1948 
Death On Coral Beach 
 
30:00 

 
238 
August 5, 1948 
Figure of Death 
 
30:00 

 
239 
August 12, 1948 
The Engagement Party Murder 
 
30:00 

 
240 
August 19, 1948 
Lingering Death 
 
30:00 

 
241 
August 26, 1948 
The Most Amazing Case of Murder 
 
30:00 

 
242 
September 2, 1948 
The Tomcat Murder Case 
 
30:00 

 
243 
September 9, 1948 
The Signet Ring Murder Case 
 
30:00 

 
244 
September 16, 1948 
Murder On a Moonlight Cruise 
 
30:00 

 
245 
September 23, 1948 
Strange Death of Stuart Blair 
 
30:00 

 
246 
September 30, 1948 
The Black Slipper Murder Case 
 
30:00 

 
247 
October 7, 1948 
Murder At 60 Miles an Hour 
 
30:00 

 
248 
October 14, 1948 
The Brocade Chair Murder Case 
 
30:00 

 
249 
October 21, 1948 
Murder in the Air 
 
30:00 

 
250 
October 28, 1948 
The Identical Twins Murder Case 
 
30:00 

 
251 
November 4, 1948 
The Howling Dog Murder Case 
 
30:00 

 
252 
November 11, 1948 
The Fashion Show Murder Case 
 
30:00 

 
253 
November 18, 1948 
Murder Meets the Train 
 
30:00 

 
254 
November 25, 1948 
Amazing Death of Cyrus Wake 
 
30:00 

 
255 
December 2, 1948 
Package of Death 
 
30:00 

 
256 
December 9, 1948 
Invisible Murder 
 
30:00 

 
257 
December 16, 1948 
Arrow of Death 
 
30:00 

 
258 
December 23, 1948 
Murder Evidence From the Dead 
 
30:00 

 
259 
December 30, 1948 
The Blue Dust Murder Case 
 
30:00 

 
260 
January 6, 1949 
Raffle of Death 
 
30:00 

 
261 
January 13, 1949 
Murdered Bridegroom 
 
30:00