Nicholas Rood, dishonest mine owner, finds a Black Doll on his desk and knows that vengeance is about to overtake him for murdering his former partner. He is knifed as he talks to his daughter Marian. She summons her fiancé Nick Halstead, a private detective. He finds that six people had a motive for the murder; Rood's sister Mrs. Laura Leland; her son Rex; Rood's associates Mallison and Walling; Esteban, a servant and Dr. Giddings. Sheriff Renick and his deputy Red get the clues all mixed up, but Nick finally narrows the search down to one suspect...
Donald Woods
as Nick Halstead
Nan Grey
as Marian Rood
Edgar Kennedy
as Sheriff Renick
C. Henry Gordon
as Nelson Rood
Doris Lloyd
as Laura Leland
John Wray
as Walling
Addison Richards
as A.H. Mallison
Holmes Herbert
as Dr. Giddings
William Lundigan
as Rex Leland
Fred Malatesta
as Esteban, the butler
Inez Palange
as Rosita, the housekeeper
Syd Saylor
as Deputy Red
