There is a point in every human being when they are lonely. Lisa Brenner knew that moment. When her body is found one gray morning in front of a high-rise building, having fallen from the 12th floor balcony, she leaves behind a number of men who adored and loved her. Lisa was so close and devoted to all of them that in the end nobody knew if he was really her favorite. A tricky case that also deeply shakes the trust between Leitmayr and Batic.

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Franz Leitmayr leaves town for Oktoberfest because he can't stand it, but is called back because his fingerprints are on a dead man's wallet. The victim appeared drunk but has almost no blood alcohol level. His GHB level is another story, and shutting down the beer tent where he obtained his tainted alcohol is a problem during Oktoberfest. And the victims continue to pile up.

Two shots are fired in a family home in Munich. Batic and Leitmayr find Michaela Danzer dead and her partner Daniel Ruppert unconscious. Quirin, the dead man's six-year-old son, has disappeared along with the murder weapon. During the emergency operation, the doctor discovers a scar from an old gunshot wound on Daniel Ruppert's abdomen, leading Batic and Leitmayr to the trail of an attempted family suicide in Augsburg fifteen years ago. Back then, in an act of sheer desperation, Daniel Ruppert shot his wife and young son. He himself survived, as did his then seven-year-old daughter Ella, whom he couldn't bring himself to shoot. He dismissed her before turning the gun on himself. The fact that the perpetrator from back then is the victim of today is a major headache for Batic and Leitmayr, as is the search for Ella, who is now a young woman and whose trail is lost after numerous therapies. Who shot Ruppert and his new wife that night? And where is Quirin?

Ben Schröder is stabbed by a stranger while walking with his family in broad daylight, before the eyes of his wife Ayumi (Luka Omoto), his six-year-old son Taro, and numerous witnesses. During the interrogations, Batic and Leitmayr found a confusing multitude of truths, when the observations of the eyewitnesses contradict each other. The highly complex investigations drag on for several months without any results until the investigation is closed. Then a second victim is stabbed.