While Katja deals with the terrible news about her father's death, Lothar argues with Joe about how the situation was handled.

Joe tells Katja that her father actually committed suicide. The others back at the station are unable to find out any information about what happened to the weapon that night.

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

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.

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.

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.

Yvonne and Oskar bond over a reading of Rainer Maria Rilke's "Der Panther." Meanwhile, his brother continues to make big plans...

Oskar tells his brother that he won't be giving him his money. He then visits Yvonne's house, but is quite shy around her.

Mr. Ohrmann tries to call to turn himself in, but the line is busy. Luckily, Dr. Gössel is determined to give him a chance.

Oskar finds out that he is terminally ill and only has four weeks to live. Meanwhile, Yvonne's sponsored child from Zimbabwe shows up at her front door.

Marga confronts Mr. Ohrmann with her terms, but it may be too late for him to do the right thing and save himself.

Oskar has a crush on his neighbor, a famous actress, but only has contact with her through the items she gets sent to his store.

When the police come to search his house, Mr. Ohrmann entrusts Marga with incriminating documents. The window of opportunity is there, but Marga starts to feel quite unsure about the whole thing.

Sibel wants Christian to leave his wife, but Christian feels that the illicit nature of their relationship is what is keeping the passion alive.

Marga's new friendships continue to develop as she considers her options and tries to determine the best way to take down Mr. Ohrmann. At the same time, she has also begun to sympathize with him.

How long should a relationship last? The two patients in this therapy session present diverging opinions on how love develops.

Julia met a really nice guy at a party that the three friends attended. The next day, they talk about how she should proceed.