Tune in for danger with a collection of radio mysteries that involve the medium of radio itself! Master sleuth Ellery Queen has to solve a murder that takes place in his own studio - right in the middle of his show - in "The Armchair Detective" (originally aired on CBS on March 27, 1946). Then, Dan Holiday is hired by a radio actress who fears for her life in "Actor's Alibi," a syndicated episode of Box 13. A radio announcer plots his wife's murder and cooks up a perfect on-air alibi in "Brief Pause for Murder" from The Whistler (originally aired on CBS on September 11, 1949). And finally, Sam Spade finds that a radio drama leads to real-life murder in "The Soap Opera Caper" (originally aired on NBC on February 16, 1951).