A mid-age hipster in Stockholm is a training freak and trains for the 90 km ski race Vasaloppet. His sister is the opposite, no job, drinks but has a daughter. Suddenly secrets reveals and promises are made.
A young gang member is found dead, and the Beck group's investigation indicates that a drug network is behind it. Klas Fredén has been monitoring the network for a long time, and the Beck group - led by Alex Beijer - is most graciously allowed to work with the murder investigation in parallel. She will soon end up on a collision course with Fredén. Thus, Martin Beck, who is now head of department, is also involved in the case.