It is August 26, 1938. Arthur Nebe, Kripo head, meets Bernhard Gunther, private investigator, in the middle of the night. It seems that Heydrich thinks Bernie would be useful to him if he were back in Kripo.
Frau Lange is a new client. She wants Bernie to find out who is blackmailing her. To investigate the case he goes to stay in a clinic in Wannsee. Psychoanalysis has been banned, psychotherapy is the order of the day. Dr. Meyer, Bernie's physician, is a Jungian. Homosexuality is a criminal offense under the German Penal Code Section 175. Bernie's partner is murdered, the alleged blackmailer commits suicide, and Bernie is back at Kripo with a higher rank. He is working at Heydrich's behest to solve a serial murder case. He is now Kommissar Gunther.
There are four dead girls and another missing. When Bernie learns from the Kripo head of unoffficial mercy killings, he knows that things have already gotten worse than he imagined. The body of the fifth victim is found through an anonymous call to Kripo.
A suspect who through investigation becomes a nonsuspect turns up dead and a sixth girl, a fourteen year old attending a fee paying school, is missing. A schoolmate of the girl recalls a man wearing a uniform stopping his car near the school. Some of the men start to believe that one of their squad members has killed the nonsuspect. Gunther eliminates the man from the squad notwithstanding his protests that his actions are nothing compared to actions of higher officials.
In order to break open the case the squad decides to use another young girl as bait. Two SS men are responsible for the crimes. Bernhard Gunther solves the mystery just before Kristallnacht. The book is outstanding. The dark morally chaotic universe of National Socialism is portrayed admirably.