A nondescript house on the outskirts of Stockholm is blown up—by a shot from a pistol, an unknown man commits suicide. A petty criminal is found murdered in his apartment. A car is discovered at the bottom of a bay, with the body of a person—without a jaw. Someone has stolen the police inspector’s son’s toy fire truck. What could these seemingly—completely unrelated—events have in common? And who, in the end, is that How-do-you-call-him?