Christian Agata, a sarcastic and brilliant criminologist, is invited by the Gulmar family, board game tycoons, to relaunch their classic “Crime Castle” at their Aosta Valley estate. An avalanche isolates the castle, and Carlo Gulmar is found dead, face buried in a cake. With his enthusiastic fan-sergeant Gianni Cuozzo, Christian must navigate absurd theories and family secrets to find the killer still inside the villa.