Helen O'Neill is engaged to wealthy Will Crosby. At a party in the Crosby home, an eccentric Irish medium has been invited to hold a seance. The woman is Helen's mother and she persuades Helen not to tell the group in order to spare Helen embarrassment. In the course of the seance, while all doors and windows to the room are locked, a man is killed. The police are unable to locate either murderer or weapon. Suspicion falls on Helen and her mother is worried. Many surprising developments ensue before the real criminal is unmasked by the clever medium. An unusual and thrilling play.