This "Crime Club" series entry is based on a novel by Jonathan Latimer. Preston Foster and Frank Jenks make return appearances as Latimer's freewheeling private eyes Bill Crane and Doc Williams, here assigned to protect millionaire John Essex (Ray Parker) and John's sister Linda (Frances Robinson) from harm. Someone has been sending Linda threatening notes, eventually carrying out those threats by kidnaping the girl and holding her for ransom. Piecing clues together with the aplomb of two veteran jigsaw-puzzle aficionados, our heroes expose the Least Likely Suspect as the culprit, leading to even more surprises before fadeout time. Perennial dumb blonde Joyce Compton enlivens the proceedings as Doc's addlepated girl friend Dawn Day. ~ Hal Erickson, Rovi