It's the summer holiday, and Little Allan is home alone. But his older neighbor Helge will take care of him. Helge is fascinated by space, and it doesn't take long before Little Allan is pulled into Helge's plan to get in contact with aliens.
At a grisly murder scene sits a figurine made of chestnuts. From this creepy clue, two detectives hunt a killer linked to a politician's missing child.
