People in an old, dark mansion are menaced by a maniac called "The Black Ace".
Chester Morris
Neil Broderick
Vivienne Osborne
Martha Winters
Frank McHugh
Clancy
Allen Jenkins
Dugan
Henry Stephenson
Thornton Drake
Grant Mitchell
Austin Winters
Charles Middleton
Jerry Simons
Virginia Howell
Mrs. Quincy
Oscar Apfel
Asa Marsden
Cornelius Keefe
Henderson
Gus Robinson
Pompey
Edward LeSaint
Coroner
