A family living on a remote island learns an escaped prisoner may be in the area. Allan (Sterling Hayden) is the professor who studies the migratory habits of birds. His wife Clea (Maureen McNalley) has a fascination for all things dead. Her sister Lis (Susan Strasberg) is visiting to break the news of her impending marriage to an older man. Clea leaves tobacco and food out for the unseen escapee. Lis meets the prisoner (Stuart Whitman) on the beach and the two make love. The quiet paradise is interrupted by the escaped prisoner who later suffers a potentially fatal wound while killing another man.
by Dan Pavlides synopsis