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.

A man is found dead at a flea market in southern Stockholm. It looks like an ordinary robbery gone wrong, but the investigation takes an unexpected turn.

Three men enter a luxury apartment in Stockholm dressed as couriers. But what appears to be a robbery ends in a brutal murder that resembles an execution. Vilhelm Beck's patrol is the first to arrive. Haunted by his memories as a hostage, Vilhelm soon begins his own investigation into the case, which leads to a surprising contact with the Beck group.

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.