One night before Christmas, two people are looking for a hostel in Saarbrücken: the heavily pregnant Sicilian Maria secretly left the house of her parents-in-law shortly before she gave birth. Taxi driver Jupp has eloped with his colleagues' Christmas bonus. Maria and Jupp get to know each other when the beautiful Sicilian woman asks the taxi driver to drive her to her grandmother's in Sicily. Meanwhile, Jens Stellbrink and his small team are investigating the events that led to the death of the Saarbrücken taxi driver Theo "Teddy" Diehl . The chubby young man went into reflex cardiac arrest when an unknown perpetrator strangled him with the string of lights that Teddy was about to decorate his Christmas tree with.
Stellbrink would like to interview the taxi driver with whom Teddy lived in a two-man flat share: But Jupp has left. On the way to solving the mystery, Stellbrink & Co come across a blackmail affair, a Sicilian family drama, a German marriage drama and a hit-and-run accident.