Frau Starke finds a diary that reveals that her husband had an alibi, proving he couldn't have murdered Katja's father.

While speaking with his uncle, Oskar takes stock of his life and starts to cry, which his uncle attributes to a broken heart.

Everyone weighs their options regarding the suspect's wife, who remains in custody, while Nicki's father proves himself to be a very difficult person to get along with.

Katja tells her mom that the police have found the murder weapon that killed Katja's father. Meanwhile, the wife of the top suspect is brought in for questioning.

Yvonne is crushed after Oskar leaves, and has a hard time getting any emotional support from her mother.

Yvonne falls for Oskar and says she would like to continue their relationship, but Oskar bids her farewell, knowing that it can't continue.

While Katja, Ben, Henning, and Harry all look into the weapon that has surfaced, Lothar meets Nicki's father, who is a very difficult person.

Oskar enjoys a date with Yvonne in which they mainly talk about her – but he also writes her a letter with the truth.

Katja learns that the gun found on a teenager is the weapon used years ago to kill her father, who was also a cop.

Yvonne's mother seems to have her own agenda. Oskar and Tom's uncle Oskar suddenly appear at the bookshop.

Lothar finds out why Nicki is so stressed out about her upcoming exam. Meanwhile, Katja and Ben investigate when someone overhears a gunshot.

While Yvonne tries to impress the casting agents, her alleged sponsored child tries to get Oskar's brother involved in the scam she is running.

Everyone at the station speculates wildly when Dirk is mysteriously called away. Meanwhile, Katja observes the anniversary of her father's death.

Yvonne auditions for a role that has parallels with her own life, but the casting agents are skeptical of her.

Yvonne's mother shows up and she tells him about the arrangement with Oskar. They begin to fight, prompting Oskar to leave quickly.