Cast & Crew
Warrant officer Henry Houghton, discharged from the staff of the British Embassy in Warsaw because of his disgraceful drinking, returns to England and is assigned to the Navy's Underwater Weapons Establishment at Portland. Soon afterwards he is contacted by a friend of his former Polish girl friend and blackmailed into the Soviet spy ring led by Gordon Lonsdale. Houghton becomes friendly with spinster Elizabeth Gee, who has access to keys to the department's safe. He gains her assistance in stealing documents and convinces her to give them to Lonsdale, in spite of the fact that Elizabeth believes Lonsdale to be a NATO officer. Lonsdale photographs the documents and passes them on to London book dealer Peter Kroger and his wife, Helen, who then transmit them by radio to Moscow. Houghton's free spending of money from his illegal income soon arouses the suspicion of the British intelligence service, and it is not long before they track down and arrest the members of the spy ring.
Released in Great Britain in 1964 as Ring of Spies. The film is based on the Portland (England) Spy Case, 1961. A narrator introduces the film with documentary footage of the actual spies.