 Near the end of the war in Germany, GI Steve Boland, a self-described "sharp-operator", meets a German girl, Ilsa (Violet Rensing), and they fall in love. Ilsa s brother Karl (Richard Jaeckel), whom she has not seen in three years, and his fellow-Nazi Ludwig (Arvid Nelson)visit Ilsa. Karl proudly informs her that he and Ludwig are "Werewolves", a group of Nazi assassins parachuted behind Allied lines for the purpose of killing Allied High Command officers. She and Steve go to Army Intelligence with they information, where Steve is immediately arrest for being A.W.O.L. Captain Melton (Dennis McCarthy) of Army G-2 intervenes on Steve s behalf, as G-2 has had a suspicion about the existence of the "Werewolves" but no concrete info before now.