Watch FMovies. Detective Mona Seiler’s new case: 17-year-old Samuel Plessen, son of famed psychotherapist Fabian Plessen, is found dead. Clues point to the notorious “Beauty-Killer,” so Mona enlists profiler Oliver Kern. As more victims surface, linked to Fabian’s hidden GDR past and a missing sister, Mona races to protect Fabian’s daughter before the killer strikes again.