The murder of a prostitute in Nazi Germany-occupied Warsaw in 1942 causes Abwehr Major Grau to start an investigation, as she was also a German agent. His evidence soon points to the killer being one of three German generals: General von Seidlitz-Gabler; General Kahlenberge, his chief of staff; or General Tanz. Grau's investigation is cut short by his summary transfer to Paris at the instigation of these officers.