Driven to desperation by his young and extravagant wife, alienist Dr. Emil Brandt has arranged a perfect crime; now he begs the police to lock him up before he can commit it.

After socialite Lynn Llewellyn receives an anonymous threat, he is poisoned at his uncle's casino, and although he recovers, his wife is murdered by the same killer.

Roommates panic and plan when they hear a radio report of a murderer loose in their neighborhood.

An attorney enraged over the prosecution of two innocent people goes on a killing spree.