The box-office failure of this British-made film may have led writer-producer Robert L. Joseph to re-work its basic idea of an investigation into the murder of a psychiatrist as a second film script a few years later - the American-made TV movie Companions in Nightmare (1968) has a very similar premise, and takes its title from a line in this film.
Stephen Boyd had become such an established Hollywood star that he here plays an American expatriate, despite the fact that he was British-born, raised in Belfast and began his acting career in England.
The sarcastic remark about cigar-smoking made by Dr. Gillen (Paul Rogers) to his junior (James Maxwell) paraphrases a famous saying of Sigmund Freud's.
First feature film with a score composed by Richard Arnell, who worked on only three subsequent productions (although he did compose for short films, documentaries and TV shows).
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