This case gets under Chief Inspector Sina Engel's skin. Eleven-year-old Fabian has apparently run away from home – and it's unclear why. The freezing temperatures increase the pressure to find him: a child cannot survive on the streets in such weather for long. Then, a refugee is shot in front of his accommodation, and the murderer escapes unnoticed. Time is also of the essence here. The suspected far-right motive raises concerns about significant media attention. Sina is assigned her colleague Matthias Sommer for support. The two share a brief flirtation, but after the birth of Sina's daughter, their contact has ceased. However, the spark between the charismatic ladies' man and the young single mother has by no means extinguished. Can they put their emotional chaos behind them and solve the cases?.