The Saint Closes the Case

Unlike previous Saint stories, which were straightforward realistic crime dramas, this tale saw Simon Templar entering the realm of both science fiction and spy fiction. The novel starts an unspecified length of time after the events of Enter the Saint with an account of Simon Templar, The Saint, foiling an assassination attempt on a visiting prince by tricking the would-be assassin into blowing himself up. This leads to The Saint becoming a cause célèbre among the British people, to the point where the government offers him not only a full pardon for past crimes, but also a job as a sanctioned crime-buster. Templar politely refuses, saying he prefers to remain underground, his identity a secret to all but a select few. (He would revisit this decision, however, in the later story “The Impossible Crime” (featured in the collection Alias the Saint) and again in the novel, She Was a Lady.)

Over the next three months, the Saint operates so far in the shadows that the general public thinks he has retired or disappeared. During this time, Templar hears from a reporter friend about troubling indications that conditions for a new war in Europe might be brewing (Templar insists that after the events of the First World War there wouldn't be another such war "for hundreds of years"). Later, during an outing in the countryside with fellow adventurer and girlfriend Patricia Holm, Templar stumbles upon a secret British government installation where he and Holm witness the testing of a deadly and mysterious weapon—the electroncloud machine, which creates a vapour capable of turning anything (and anyone) it touches into ash.Templar and Holm are about to leave when they encounter a giant of a man named Rayt Marius, an evil tycoon who wants the weapon for his own purposes. After escaping to safety, Templar determines that he and his team must steal or destroy the weapon before their government—or any other—can use it against people. Not only that, but the weapon must not be allowed to fall into Marius' hands. In order that such a weapon never be re-created, Templar also plans to kidnap the device's inventor and, if necessary, kill the scientist.Things become complicated when Marius kidnaps Patricia Holm, setting Templar off into an uncharacteristically murderous rage. Meanwhile, Scotland Yard Inspector Claud Eustace Teal also finds himself getting involved, even though the identity of The Saint remains a mystery to him.After rescuing Patricia from the clutches of Marius, Templar realises that his quest for anonymity is at an end (with both Marius and Teal now aware of who he really is) and begins to make plans to leave the country (along with his compatriots if they so choose). But first he must try to convince the inventor of the electroncloud to abandon the weapon; when the scientist indicates that he not only refuses to give up his work, but might also be mad, Templar reluctantly decides the man must die to potentially save the lives of millions.Before he can execute the scientist, Templar's base is attacked by Marius, who is revealed to be working for the same prince Templar earlier saved. During the melee, one of Templar's men, Norman Kent, completes the Saint's orders and kills the scientist; he does so after determining that whoever killed the scientist would be likely to hang for murder if caught, and out of loyalty to Templar chose to take the chance himself. It is also revealed that Kent, who had only been mentioned briefly in previous Saint adventures, harboured an unrequited love for Patricia Holm, possibly originating from a Mediterranean cruise on which Templar had assigned Kent to take Holm to keep her out of trouble (as indicated in Enter the Saint).Later, while being held at gunpoint by Marius and the prince, Kent reveals that he killed the scientist, but not before being given the man's final notes on the electroncloud. In exchange for Marius and the Prince allowing the Saint and his friends Patricia and Roger Conway to go free, Kent agrees to hand over the documents.After Templar and his group (save Kent) depart, Kent reveals that he has played a trick on Marius and had secretly passed the notes off to Simon before his departure. As the book ends, Marius shoots Norman Kent dead as he stands in front of a window to stop Marius shooting through it.

The tone of the book is far more romantic and tragic than the average Simon Templar books. In most books of the series, the reader can know in advance that no matter what terrible threats and perils Templar would face, he would survive them all and live to have new adventures in the next book and the next.