Mamma Moo wants to see the world. Crow has already seen everything. When Stork shows up at the Farm and starts building a nest, Crow is challenged by someone who actually traveled the whole world. Mamma Moo gets the feeling that there is so much more out there to see than her usual pasture, Crow tries his hardest to convince her to stay where she belongs – like a normal cow.

A body is found in the water near Liljeholmen. The body belongs to a 39-year-old Danish citizen with a solid criminal record and who was a member of a notorious Danish drug gang. Should the Beck Group get a gang war on their necks? Martin Beck is back to the joy of the entire Beck group. Martin's daughter Inger is not as happy but has to accept her father's decision to start working again.

Police trainee Vilhelm Beck is out on an internship with his supervisor when, during a routine burglary case, he finds a dead 17-year-old boy at the scene of the crime.

Mamma Moo produces a musical and realizes that it is a part of her identity. However, her brother, Teddy Bear disappears due to her fault. Crow asks: “why couldn’t you be a normal cow?” Mamma moo refuses to be ordinary, but at the same time, she has to take responsibility for her choice. Mamma Moo comes to visit her brother with Crow. It is also a way to confirm another identity of hers. Along with her breezy move.

Petra's seemingly perfect life unravels when her husband has an affair. Meanwhile, young Petra embarks on finding true love. Two women's journeys of self-discovery span different life stages, offering a hopeful yet painful view on love.

When Alex is alerted to a brutal murder, she brings the temporarily suspended Vilhelm and her colleague Josef to the crime scene. The victim turns out to have connections to the digital university Howl, which investigates the role of men in a changing world. At the same time, the case is linked to an older investigation into the "Balcony Man", which brings Martin Beck back to the department.

Follows Marcus Tell and Ann Wilding, the Swedish police's most unlikely duo, forced to unite when their seemingly vastly different investigations lead to the same dramatic conclusion: an attack during Stockholm's Nobel Week.