Commissioner Vincent RuizIn has no more sympathy then his colleagues for loner psychology professor Dr. Johannes Jessen, yet enough professional respect to seek his help as gifted profiler. Jensen realizes the unidentified female corpse is no prostitute but rather a nurse. As she's identified as a former patient of Jensen, the police starts to suspect him given links to more dark deaths in his past, while he realizes his enigmatic present therapy patient Robert Mohren is the key but can only prove it if he stays at large, requiring help from his ex and a former assistant, thus discovering a tragic mistake belatedly.