Adventure and intrigue await all ye who venture into the small and sinister village of Moonfleet on the windswept moors of Dorsetshire. Here, young John Mohune (Jon Whiteley) arrives at his ancestral estate, now owned by the dashing, and mysterious Jeremy Fox (Stewart Granger). Out of love for the boy's mother, but against his better judgment, Fox grudgingly allows John to stay. He soon becomes attached to the boy, but his devotion is tested when John discovers a hidden smugglers' lair beneath the village graveyard and learns a shocking secret that could cost both him and Fox their lives.