The Vanishing (1988)

Rex and Saskia are on holiday, a young couple in love. They stop at a busy service station and Saskia disappears. Rex dedicates the next three years trying to find her. Then he receives some postcards from her abductor, who promises to reveal what has happened to Saskia. The abductor, Raymond Lemorne, is a chilling character to whom Rex is drawn by his intense desire to learn the truth behind his lovers disappearance. The truth is more sinister than he dared imagine.