The Saint is contacted by Jonathan Roper, who is training a small international army, which he invites the Saint to join. In fact the Saint is working undercover for British military intelligence who are curious as to what Roper's plans are. Roper informs the Saint that he wants him to lead an assault on an army vehicle, stealing uniforms. It becomes apparent that Roper intends to disguise his men as British soldiers for criminal purposes. The Saint sets out to stop him.