Operation Crossbow (film)

Operation Crossbow, later rereleased as The Great Spy Mission, is a 1965 British spy thriller and World War II film, directed by Michael Anderson and written by Emeric Pressburger, under the pseudonym Richard Imrie, Derry Quinn and Ray Rigby from a story from Duilio Coletti and Vittoriano Petrilli. It was filmed at MGMBritish Studios.

The Germans move their factory underground in Southern Germany for protection and rush ahead with the development and production of the larger, more deadly V2. The head of British intelligence John Mills learns that engineers are actively being recruited across occupied Europe for the new weapon and decides to infiltrate the factory. He finds three qualified volunteers, all experienced engineers who speak fluent German. They are hastily trained and sent to Germany via the Netherlands. Amongst the volunteers interviewed but not selected is a British officer named Bamford Anthony Quayle, who is actually a German undercover agent.Just after the British agents are parachuted into occupied Europe, British Intelligence learns that one of them, Robert Henshaw Tom Courtenay, has been given the cover identity of a man wanted by the police for murder. Sure enough, he is arrested, but released after being blackmailed into becoming an engineer and an informer. However, he is recognised by Bamford, now working as a security officer. Refusing to reveal his mission, he is tortured by the Gestapo and then shot when he refuses to cooperate. ........

Source: Wikipedia