Puzzle

Nordic Crime Extraliga. From the author of The Net and The Fourth Victim

On a sunny day in August, a long-imprisoned man is released from prison. On a rainy day in April, children playing with him find his corpse. Was he killed because someone thought he wasn't punished enough? Or was this someone afraid of his revenge? After all, the alleged double murderer has never confessed to his crimes and has always maintained his innocence?

Inspector Van Veeteren has a terrible suspicion: wasn't he telling the truth after all, and so isn't the real killer still at large?