Bäckström is first on the scene after the celebrity lawyer Tomas Eriksson is murdered. The police cannot initially rule out that Bäckström himself is the killer. Eriksson was his nemesis. At the same time, new information about the victim's love life is revealed.

An old Russian music box made of gold, depicting the fairy tale character Pinocchio worth around SEK 300 million, seems to be the motive for the murders. Bäckström is trying to map the game owner's former owner in the hope of being able to seize the treasure himself.