The investigator Nora Weiss (Anna Maria Mühe) and her new colleague Ben Salawi (Camill Jammal) are investigating the case of the Lübeck psychology professor Peter Marquart (Hans-Jörg Frey), who was drowned in his own bathtub. A first clue leads her to the 16-year-old student Jessica Steiner (Lieselotte Voß), who posts revealing pictures and videos of herself on her own paid website. Shortly thereafter, a daycare manager is murdered.
Young farmer Max asks his lady-in-waiting all the questions: Does she want to be his first girlfriend? And Michael K. also wants to know: does his visitor have a knack for his cows? After many years, Ulf dares to get on a horse again. Can he really make an impression with his riding skills?
Sam Gerard (Tommy Lee Jones), veteran detective leader of the U.S. Marshal's Offices, is known for his tenacity in pursuing fugitive criminals. Therefore, he is also assigned to Mark Sheridan (Wesley Snipes), who is said to have murdered two agents, but survived the crash of the plane that was supposed to take him to prison and has been on the run ever since. But during the pursuit, Gerard begins to question whether Sheridan is really who he is believed to be.
An emergency call is received by the Bremen police, cries for help can be heard. A short time later, the body of a young woman is found in a park. The massive injuries to the dead man's neck pose a particular mystery to Bremen's chief inspectors Inga Lürsen (Sabine Postel) and Stedefreund (Oliver Mommsen). A traumatized eyewitness can only provide investigators with the disturbing clue "vampire". While Inga Lürsen pieced together the clues and clues step by step, Stedefreund got caught up in a feverish whirlpool of mystical superstition.
Amy Silva (Suranne Jones) investigates a murder aboard a nuclear submarine. There are already several suspects and two more dead: a young woman on land, the cook of the "Vigil" on the boat. Parts of the nuclear submarine have been contaminated with a deadly poison and are restricted. There must be someone on board sabotaging the mission. Amy dares a dangerous mission, at the end of which she finds herself in mortal danger.
