The Trygon Factor

A Scotland Yard detective is investigating a string of robberies and a murder, and the information he uncovers leads him to the estate of a wealthy but strange English family, who share their mansion with a group of nuns. The detective comes to suspect that neither the family nor the nuns is quite what they seem to be.

Cast: Stewart Granger, Susan Hampshire, Cathleen Nesbitt, James Culliford, Brigitte Horney, Robert Morley