Katarina Huss follows in her mother's footsteps and becomes a detective with the Göteburg police. As a newcomer to the force, she has to contend not only with the hard life of Gothenburg but also with her suspicious colleagues.

A boisterous young family move in next door to an isolated retiree with strict principles and a short fuse, and a mailbox accident begins an unexpected friendship.

Evert Bäckström is a rock star among cops and a genius at solving crimes; a woman's skull is found, and Bäckström sees a case only he can solve.