It's the 400th episode of "Down These Mean Streets!" To celebrate, I'm sharing the first detective shows I heard - the episodes that sparked my love of old time radio mystery drama. Join me for "The Big Scoop Matter" from Yours Truly, Johnny Dollar (originally aired on CBS on November 11, 1956); "The Case of the Careworn Cuff" from The New Adventures of Nero Wolfe (originally aired on NBC on October 27, 1950); "Night Tide" from The Adventures of Philip Marlowe (originally aired on CBS on May 21, 1949); "The Death Bed Caper" from The Adventures of Sam Spade (originally aired on CBS on June 20, 1948); "The Louis Spence Case" from Richard Diamond, Private Detective (originally aired on NBC on March 3, 1950); and "Greed Causes Murder" from The Saint (originally aired on NBC on September 14, 1949).