William Gargan

Ellery Queen

Margaret Lindsay

Nikki Porter

John Litel

Norman Hadley

Charley Grapewin

Insp. Queen

James Burke

Sgt. Velie

Frank M. Thomas

Capt. H.T. Daley

Lilian Bond

Adele Belden

Morgan Conway

Ray Stafford

Jack La Rue

Tommy Gould

Noel Madison

George Belden

Charlotte Wynters

Mrs. Irene Evington Hadley

Johnny Arthur

Riley - Reporter

Jimmy Aubrey

Door Sign Painter

Marie Blake

Motel Landlady

Billy Bletcher

Quarantine Sign Poster

Ralph Brooks

Gambling Casino Patron

Arthur Q. Bryan

Waymond Wadcwiff

Jack Chefe

Waiter