Blackie is the natural suspect when an expensive pearl necklace is stolen while he is supposed to be guarding it.
as Horatio 'Boston Blackie' Black
as Doris Howell
as Insp. William R. Farraday
as Joan Howell (as Patricia White)
as The Runt
as Sgt. Matthews
as Igor Borio
as Margie O'Reilly, alias Sandra Doray
as Mason Carter
as Claire Carter
as Helen Kenyon
as Party guest
