Templar is having a drink at a bar in Naples when he witnesses a mêlée between two of the customers. It appears that one of them has mistaken the other for an old colleague. Templar's suspicions are raised the next morning when he reads in the newspapers that one of the men has been murdered. He begins to investigate only to find himself thrown into the world of the Sicilian Mafia, and that few people are willing to help him.
Having survived a bomb attempt on his life the Saint tells Gina that her uncle is a high-ranking Mafia member. He is, in fact, being chosen as a replacement for the dying Don Pasquali, the current Mafia head. Gina eventually believes him. The Saint goes to the family vault to find out what happened to the real Allessandro, but he is captured by the Mafia gang and taken to see Don Pasquali and his replacement. He has to think very fast to sow the seeds of discord into the minds of those present and bring the vendetta to an end.
In the South of France the Saint becomes friends with Texan adventurer Rod Huston and the famous mathematician Henri Flambeau and his daughter Janine. They are all amazed at the luck that seems to follow Boris, the ex-king of Slavonia, at the card tables and Henri is convinced that such a run of wins can only mean one thing - the ex-king is a cheat. It soon becomes clear that he is trying to amass enough money to try and regain his throne. The Saint and Rod discover the factory where the king's specially marked cards are made and destroy them, whilst Henri takes the ...
The Saint is lured to a house in Cornwall by two attractive young sisters in which he meets their father, Keith Longman, an eccentric millionaire. He tells the Saint that he is dying and that he plans to have himself frozen in suspended animation until such time that a cure can be found for his illness. He also plans to use the Saint as a guinea pig in testing out the process.
Alan Williams is found dead having rung the Saint for his assistance. Pop singer Diane Huntley, a friend of Alan's, takes the Saint to meet a guru who runs meditational sessions at a hefty price, and the Saint is convinced the guru is behind the murder. Diane tells the Saint that Alan had a younger sister Brenda, who also saw the guru and who committed suicide. Alan had painted a portrait of Brenda and in its frame are hidden various documents which will lead the Saint to avenge his friend's death.
The Saint is invited by George Hapgood, a designer of racing cars, to test drive his latest model, but the car has been sabotaged and crashes. George's cousin Justin then asks the Saint to drive his latest car, only for a mystery driver to force that car off the road as well. The Saint suspects business-woman Kay Collingwood as being involved, given that she seems close to Justin, but she claims that her main interest is in bugging devices, not cars. The Saint gets ready to drive George's car in a rally, unaware that it has once more been sabotaged.