On a cold and rainy Stockholm night, nine bus riders are gunned down by an unknown assassin. The press, anxious for an explanation for the seemingly random crime, quickly dubs him a madman. But Martin Beck of the Homicide Squad suspects otherwise: this apparently motiveless killer has managed to target one of Beck's best detectives - and he, surely, would not have been riding that lethal bus without a reason. With its wonderfully observed lawmen, its brilliantly rendered felons and their murky Stockholm underworld, and its deftly engineered plot, "The Laughing Policeman" has long been recognised as a classic of the police procedural.