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.

The Beck group is called out to investigate the brutal murder of a man in his own home. The case takes a dramatic turn when Martin Beck's grandson, Vilhelm, ends up being kidnapped during the investigation.