After a rare gem is stolen from an exhibition at a posh hotel, Inspector Farraday decides to recruit former thief Boston Blackie to find the stone. Along with his assistant, "The Runt", Blackie focuses his investigation on the hotel manager, George Daley, and his sister, Eileen. Through disguises and ruses, Blackie and the Runt try to trick their way to discovering the thieves.
Chester Morris
as Horatio 'Boston Blackie' Black
Janis Carter
as Dorothy Anderson
William Wright
as Paul Martens
Richard Lane
as Inspector Farraday
George E. Stone
as The Runt
Robert B. Williams
as Matt Healy
Mark Roberts
as George Daley
Dorothy Malone
as Eileen Daley (Uncredited)
Joseph Crehan
as Jumbo Madigan (Uncredited)
Ben Taggart
as Traffic Cop (Uncredited)
Minerva Urecal
as Miss Wilkinson (Uncredited)
Constance Purdy
as Woman in Daley's Office (Uncredited)
