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

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

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

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

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.

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

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

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.

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.

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

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

While a hysterical Yvonne has a realtor appraise the house, Oskar's brother has a strange epiphany.

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.

Oskar fights with Danuta about who is responsible for Yvonne's breakdown. Danuta thinks she has found her lost bottle of medicine, but it's not hers.

People living in the Alps are also anxiously awaiting spring. The Imster Schemenlauf is a traditional parade to drive out the winter.