Kai, a young man, misses the last train in a subway station at night and shortly afterwards meets his future daughter. She plans to kill him before he can conceive her, because he will meet her mother on the first train the following morning. A fatal realization forces them to spend the time together until the first train arrives: Kai and his possible future. Helen and her past life with her father. And a present that could change everything.

Canapés, champagne, fireworks... and a dead body! Richard Kühn, managing director of a luxury toilet seat company, is murdered during a party - in a quiet little place of all places. The investigators are thrown headlong into the case on their night off...

Brandt is not at all pleased that Wiesel has been honored for his police work. As a silly argument breaks out between the two investigators, Köster and Seidenpfennig take over. Because a new case requires the utmost professionalism: The universally unpopular Volker Pinkwardt lies dead in his apartment with a head wound. A tragic accident or murder? More and more suspects and questions emerge. And then there's the question of why Wiesel has been behaving so strangely lately, regardless of his quarrel with Brandt?