After a robbery in his london shop, antique dealer John Mannering a.k.a. The Baron, is persuaded by Templeton-Green to work for Diplomatic Intelligence. He travels behind the Iron Curtin and meets his contact Cordelia. They encounter a corrupt Party member who attempts to frame them for the murder of his lover, the London jewel thief.

David Marlowe is kidnapped from Mannering's shop. For his release he must sell a false Renoir to Sir Robert Ellacott. Mannering calls on Templeton-Green for help. The Baron follows his orders and sells the picture but whilst visiting he meets Sir Robert's nephew Roddy and becomes suspicious. When Marlowe is stabbed by Roddy as he attempts to escape, the other gang members become nervous. Mannering has to meet Roddy with the ransom money to ensure that Marlowe isn't killed.

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