Trivia

Nigel Green had also acted in the 1959 TV Serial "The Man Who Finally Died (1959)."

Georgina Ward receives an 'introducing' credit.

Director Quentin Lawrence also directed Peter Cushing in another neo-noir thriller, "Cash On Demand". This appeared later in the same year, but had actually been filmed some two years earlier. "Cash On Demand" was a Hammer film, unlike this - although Stanley Baker had formerly been a Hammer actor.

Stanley Baker and Nigel Green would later co-star in the war classic "Zulu", released the following year.

Extremely similar plot to The Third Man only instead of a man's long-lost friend, believed dead from a week prior and possibly mixed up in criminal activity, it's a father.