@farmerman,
here's a playlist of 201 detective/mystery radio programs from the 40's and 50's
https://www.youtube.com/playlist?list=PLBiHiGDiFvmh4q5iMOs7JYpmimYOSLG_t
includes
The New Adventures of Nero Wolfe "The Case of the Phantom Fingers"
by Brent Abrahamson
30:25
The Adventures of Philip Marlowe - Red Wind
by VistaRecordsBoard
29:34
SAM SPADE Private Detective - Half Hour Radio Show c.1948 w/ Howard Duff
by cdbpdx
25:06
Box 13 - Episode 1 - The First Letter (Alan Ladd)
by VistaRecordsBoard
27:00
BARRIE CRAIG, CONFIDENTIAL INVESTIGATOR 14 The Deadly Fight
by Classic Radio
29:37
DRAGNET -- "THE GARBAGE CHUTE MURDER" (12-15-49)
by David Von Pein's Old-Time Radio Channel
29:17
Night Beat - The Night Is A Weapon
by VistaRecordsBoard
30:10
LUX RADIO THEATER: THE THIN MAN - WILLIAM POWELL GOLDEN AGE RADIO
by Dennis Morrison
58:28
Johnny Dollar: The Chesapeake Fraud Matter
by The Radio Ghost
1:13:50
The Fat Man: Murder Wears A False Face
by The Radio Ghost
30:52
The Man From Homicide: Ice Pick Murder (audition episode)
by The Radio Ghost
28:43
Broadway is My Beat "The Bad Bet, Bad Booze Murders"
by Brent Abrahamson
29:55
THE SAINT -- "THE HORRIBLE HAMBURGER" (9-10-50)
by David Von Pein's Old-Time Radio Channel
29:58
LUX RADIO THEATER: MURDER MY SWEET - DICK POWELL
by Dennis Morrison
59:19
The New Adventures of Nero Wolfe: The Case of the Party for Death
by The Radio Ghost
29:09
Philip Marlowe "The Bedside Manners" 5/30/50 Oldtime Radio Crime Drama
by The Theatre of the Mind