When the leaves fall, he will come for you... One October morning in a quiet suburb, the police make a horrifying discovery. A psychopath spreads terror in the city. A young woman was found brutally murdered, with one of her hands amputated. He leaves behind a puzzling clue. Above her, a small doll made of chestnuts hangs. But it didn't end there. When examining the doll, the forensic department is shocked to find a fingerprint belonging to a young girl who was kidnapped and murdered a year ago. Can a new killer reopen the investigation into an old murder? Two investigators are forced to put aside their differences and work together to solve the mystery hidden by the Chestnut Man. Will his thirst for blood end when winter comes – or has it not yet begun?