Cub, Copper and Trapper are asked to meet Gimlet at 10 Brummel Square, London. Here, they find not only Gimlet, but also General Sir Saxon Craig (who they had known as "Numero Neuf"). The General wants our heroes' help in tracking down the members of a Nazi Underground Movement, who call themselves the "Werewolves". Although the war is now over, they are sending prominent Britons death warrants and then kidnapping them. After a mock trial, the victim is executed. Gimlet reveals that he has received such a death warrant for his war time activities. The Commandos search for the Werewolves headquarters takes them to Sussex and the Norfolk Broads with aerial reconnaissance support from Ginger and Biggles.