Sidney Salkow Director Warren William Michael Lanyard Actor Eric Blore Jamison Actor Jean Muir Joan Bradley Actor Warren Hull Bob Penyon Actor Thurston Hall Inspector M.J. Crane Actor Fred Kelsey Detective Dickens Actor Victor Jory Clay Beaudine Actor Georgia Caine Mrs. Penyon Actor Marla Shelton Rose Waverly Actor Robert Emmett Keane Peter Van Wyck Actor William Forrest Arthur Trent Actor Roger Pryor Peter Rennick Actor Bruce Bennett McManus Actor Don Beddoe Police Doctor Actor Richard Fiske Detective Jackson Actor Shemp Howard Joe Actor Luis Alberni N. Pappakontous Actor Nellie V. Nichols Mrs. Pappakontous Actor John Francis Larkin Screenwriter Ralph Cohn Producer