AllMovie

Wealthy Adelaide Snow (Patricia Collinge) confronts her nephew Bruce (Don Chastain), who has been passing bad checks to pay his gambling debts. Rather than allow Adelaide to notify the authorities, Bruce locks the old woman in her own money vault and leaves her there to suffocate. Bruce has taken the precaution of locking one of Adelaide's pet cats in the vault as well, reasoning that the police will conclude that she entered the vault to retrieve her cat and was trapped by accident. What our "hero" hadn't figured on was that his own wife, Lorna (Jessica Walter), does not possess his sociopathic streak.