Eight-year-old Inka is missing. And while Inspector Lehmann (Peter Schneider) still hopes to find the girl alive, Henry Koitzsch (Peter Kurth) already has a bad premonition. In fact, the child’s body is discovered only a short time later in an allotment garden. The first investigations lead the detectives to Inka’s school. There Koitzsch meets an old acquaintance: the teacher Monika Hollig (Susanne Böwe) – his blind date from the first episode. At the same time, math teacher Krein (Sascha Nathan) comes under suspicion. He had an intimate relationship with his student Inka. Perhaps too intimate? The solution to the case is as unexpected as it is shocking.