Chester Morris
Horatio 'Boston Blackie' Black
June Vincent
Doris Howell
Richard Lane
Insp. William R. Farraday
Patricia Barry
Joan Howell (as Patricia White)
George E. Stone
The Runt
Frank Sully
Sgt. Matthews
Crime
Mystery
Trapped by Boston Blackie
Blackie is the natural suspect when an expensive pearl necklace is stolen while he is supposed to be guarding it.