Het geheim dat bloed zag (1987)

On his deathbed, the old Baron of Destelbergen gives a valuable treasure map to his clumsy, socially awkward son and heir, Waldo. However, Waldo quickly loses the metal container holding the map. It is first found by local children and later ends up in the hands of a poacher named Fons. Fons uses the secret map to blackmail the new baron. Greed quickly spreads through the estate, leading to a dark turn of events when Pieter, the castle's servant, murders the poacher to steal the map and claim the hidden treasure for himself.