Bobby Darin gives the performance of his career in this excellent if virtually unknown film. He is 100% believable as an American Nazi who tries to play psychiatrist Poitier like a violin with some success. Poitier is equally marvelous as the psychiatrist who must work extremely hard to take himself out of the process so he can concentrate on helping his patient. I was on the edge of my seat from beginning to end by both actors' incredibly sexy performances. Peter Falk is excellent in the small role of Poitier's young protege.