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.

Mannering is invited by Sir Frederick Alton to his country home. When he enters the house he hears a woman crying for help. As he goes to help he's knocked unconscious. He wakes up to discover that he has a twin double. Mannering manages to change places with the double and his captors kill the man they belive to be the Baron. They then let him in on their plans to steal the Crown Jewels only for Cordelia to turn up at the wrong moment.

The Baron has to convince Cordelia who he is, but he still has to play the part for his captors. He manages to get rid of Revell and the gang head to London. However, one of the gang is the best friend of the part Mannering is playing. After he's discovered, the Baron really has to steal the Crown Jewels.

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.

The Baron and Cordelia are in Switzerland when they bump into Peter Franklin, an old friend of Cordelia. Franklin, who is a CIA agent, has stolen the latest strain in a deadly virus from the laboratory he was working in. When Franklin is killed, Mannering is in a race with Sorenson, the scientist who developed the virus, and Holmes, an unscrupulous character, to discover the whereabouts of the deadly bacteria.

Mannering gets a tip-off that there will be a robbery at the Lynstead Collection. The police and the Baron lie in wait but one of the policemen is killed by the gang leader, Greg Wilde. Wilde is arrested for murder but his crooked solicitor tells him that all of the witnesses will be disposed of. Mannering escapes an attempt on his life but Wilde escapes from police custody and is out to get the Baron.

No tenemos una sinopsis en español. Ayúdamos a ampliar nuestra base de datos añadiendo una.

No tenemos una sinopsis en español. Ayúdamos a ampliar nuestra base de datos añadiendo una.

No tenemos una sinopsis en español. Ayúdamos a ampliar nuestra base de datos añadiendo una.

No tenemos una sinopsis en español. Ayúdamos a ampliar nuestra base de datos añadiendo una.