The innocent daughter of a war criminal is persuaded to help a U.S. agent trap a Nazi mastermind now living in Brazil.

The famous Dr. Edwardes takes over as head of the Green Manors Mental Asylum and finds himself attracted to Dr. Constance Petersen, but she soon realizes he is a paranoid amnesiac imposter and tries to cure him while finding out what happened to the real Dr. Edwardes.