Out of the blue, chief inspector Eva Saalfeld receives a phone call that upsets her life. Her half-sister Julia, who has been living in Leipzig for two and a half years and whom she has never met, wants to meet her. Before that happens, Julia is kidnapped by two men in front of Eva's eyes. The inspector and her colleague Andreas Keppler immediately start investigating and question everyone who is close to Julia. But Julia's friend Leon and her uncle Hamid, in whose café Julia works as a temp, cannot explain why Julia could have been kidnapped. That same night, Abdul Günes, one of Hamid's neighbors, is murdered in his apartment. The commissioners are looking for the connection betweenboth cases. When Julia manages to escape from the kidnappers shortly afterwards, the sisters finally get to know each other.
Julia is silent about possible reasons for the kidnapping. She plays cat and mouse with the inspector and only ever admits what Eva has found out. Meanwhile, Commissioner Keppler is investigating Ersoy Günes, the son of the murder victim, who runs a shisha bar as a criminal known to the police. The commissioners find out that there is a connection between the murdered man and Horst Saalfeld. Is Eva's father, who is in prison in Leipzig, involved in Julia's kidnapping and the murder of Günes? Eva Saalfeld confronts her father with this suspicion.