Voodoo rituals in 18th-century Cornwall disguise a savage indictment of the British class system in a superior Hammer horror with a strong plotline. It's John Gilling's best work, and his tight direction and ultra-stylish visuals build the tension most effectively. Especially memorable moments include the green-tinted dream sequence, where churchyard corpses are resurrected, and a quite stunning decapitation scene. A vintage bloodcurdler from Hammer's golden era.

Sir James Forbes arrives in a remote Cornish village to identify a mysterious plague afflicting the population. He discovers that one of the squires is a disciple of Haitian witchcraft and using dark magic to resurrect the dead. As the plan to create undead servants unravels, the squire unleashes his zombie army on the unsuspecting village.