Mannering attends the funeral of Jim Carey, a former army colleague. After receiving a message that Carey is still alive, Mannering agrees to go undercover for Templeton-Green. An elaborate plan to steal a $ 1 m jewel is bad enough but becomes worse when Cordelia is used as a hostage to ensure that the Baron cooperates with Carey.

The Baron does a deal with a scheming insurance agent to recover a £ 100,000 Aztec mask from an ex-con. However the former crook's gang leader has a different idea and will even hurt his one-time friend's daughter to get the mask.

When Mannering gets a message to buy The Four Horsemen, he travels to Khakania, a country gripped in civil war. The Horseman are a famous statue worth over $1m. The money from the statue will help fund the rebel cause. The Baron tries to flee the country with the rebel leader's daughter and statue but is hounded by the secret police who are always one step ahead of him.

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.

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.

The Baron and Cordelia are at the Macao docks checking a shipment of antiques. A missing crate leads to Cordelia witnessing a murder on baord a cargo ship. When she is held prisoner Mannering has to stow away on the ship. They meet an undercover CIA agent working as one of the crew who tells them about the ship's mysterious cargo and its secret destination. The CIA agent is killed and Mannering forced out into the open.

With the ship arriving at the island to deliver its cargo, Mannering learns of the plot to steal an American space capsule. Via the ship's radio he alerts the US Navy of the plot. He and Cordelia escape and they must think up a plan to stop the robbery and hope that the Navy can get to them in time to assist.

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