XY gelöstSeason 52026 · 4 episodesEpisodes1Murder at CarnivalCarnival 1988 in Cologne: 24-year-old mother Petra Nohl is celebrating with friends in the Old Town. On her way home, she is brutally attacked and strangled. The perpetrator escapes unidentified.2Deadly Night ShiftCologne, 2007: A 24-year-old woman runs a bistro together with her brother. Late at night, she is still finishing up the accounts. The next morning, her brother discovers her dead in the walk-in freezer.3Encounters with a MurdererNear Worms, a mother is found dead in her bathroom. There are no signs of forced entry. Shortly after the crime, the victim's children encounter a stranger outside the front door.4Fatal PastA toolmaker is found stabbed to death in his apartment. His car, personal belongings, and cash are missing. Initial leads point to the milieu surrounding the Cologne train station.Season 1Season 2Season 3Season 4Season 6