A boxer is killed in the ring, and the only clue is a tune that a man was whistling.
Neil Hamilton
Bill Devons
Evelyn Venable
Pauline Ward
Jimmy Wallington
Nick Nicholls
Barbara Pepper
Althea Ames
Lucien Littlefield
Watchman
Lynne Roberts
Edna Mayberry (as Lynn Roberts)
James Spottswood
Albert 'Slats' Keefe
Reed Hadley
Ralph Mortimer
