It was released in France in December 1966 as La Fantastique Histoire Vraie d'Eddie Chapman but elsewhere in Europe and the United States in 1967 as Terence Young's Triple Cross.

Triple Cross is based loosely on the story of Eddie Chapman, believed by the Germans to be their top spy in Great Britain, although he was an MI5 double agent known as "Zigzag".

In late 1930s London, debonair safecracker Eddie Chapman pulls off several safe crackings (as the Gelignite Gang) but is caught and convicted while vacationing on the channel island of Jersey and imprisoned.

In 1944, on his next mission to England, Chapman assists the British in feeding the Germans false information to divert their V-1 "buzz bombs" from falling on well-populated or strategic military targets.

In his autobiography, Christopher Plummer stated that Chapman was to have been a technical adviser on the film but the French authorities would not allow him in the country because he was still wanted over an alleged plot to kidnap the Sultan of Morocco.

[3] On 30 June 2023, in The Times, Kevin Maher gave the film 4/5 stars, observing: “Derided on release as a lacklustre 007 knock-off from the Bond maestro Terence Young (Dr No, From Russia with Love), this Christopher Plummer vehicle has aged into dark pulp perfection.”[4]