Johannes and Konstantin try to find Sascha's father. Then Sascha's mother comes to visit Johannes to compare notes – and accidentally rings Marion's bell.

While Lothar, Dirk, and Nicki contemplate life and death at the station, Miriam's baby disappears from the hospital and is known to be in grave danger. Meanwhile, Harry and Henning try to get to the bottom of the mail theft case that has caused a dispute between two neighbors.

All is lost for Johannes: He's unable to convince Marion that he didn't walk out on her, and even Sascha won't speak to him anymore. Johannes takes it upon himself to find the boy's father.

Miriam's mother finds out that Miriam skipped school and locks her in her bedroom. Meanwhile, Henning and Harry investigate a fight between neighbors, and Dirk deals with Kutte.

Marion and Johannes share a bottle of wine together, and Marion admits that she has feelings for him and sometimes wishes they had never split up. But their moment is interrupted when Sascha appears and has a terrible accident.

The young mother cannot be found anywhere, and we learn that she is in high school and still lives at home. Kutte is found camped out in front of the precinct, despite Dirk having secured him a place to sleep at the night shelter.

While Johannes tries to win Marion back, Sascha's parents continue fighting. He overhears his mother accusing his father of cheating – and his father denying it.

Katja and Ben are part of a rare and special moment that then goes terribly awry: a woman gives birth to a baby boy before disappearing suddenly.

Dirk tries to console and help a homeless man named Kutte whom he has known for 15 years. While on patrol, Ben and Katja come across a young woman buckled over in severe pain.

Johannes, Sascha, and Marion are having a great time together at her apartment until her new boyfriend shows up unexpectedly – with plans to propose to her.

Marion spends a nice day at the sea with Johannes and Sascha, and is impressed at how well Johannes gets along with the boy. Then Sascha asks if they can bake cookies together.

Johannes devises a plan to get Marion back – but when things goes awry, it turns out she's actually just as moved by his openness towards Sascha.

While Sascha's parents continue fighting, he lays out his Christmas list. At the shop, Johannes plots to get Marion back – but it seems as though she's happily moved on.

While Johannes spies on his ex-wife and her new boyfriend at the Christmas market, Sascha confronts him about the promises he made.

The real bank robbers are caught and now it is time to find the other half a million euros. Luckily, Paschke has a hunch where it has ended up, and is able to help the police catch the other thief in time and have a merry Christmas.