The Nazis will kill to protect it. The Allies will die to uncover it. With the war on a knife-edge, the best weapon against the Third Reich may not be a weapon at all ... Autumn, 1941. The war is going badly for Britain and its allies. If Hitler is to be stopped, a new weapon is desperately needed. In Cambridge, professor Tom Wilde is approached by an American intelligence officer who claims to know of such a weapon - one so secret even Hitler himself...