Young workers are dying because of a mysterious epidemic in a little village in Cornwall. Doctor Thompson is helpless and asks professor James Forbes for help. The professor and his daughter Sylvia travel to Thomson. Terrible things happen soon, beyond imagination or reality. Dead people are seen near an old, unused mine. Late people seem to live suddenly. Professor Forbes presumes that black magic is involved and someone has extraordinary power. He doesn't know how close he is: the dead become alive because of a magic voodoo-ritual, and so they must serve their master as mindless zombies...
Some followers of Satan want to sacrifice the niece of the Duke of Richeleau. But they did not think that the duke might be more powerful than their master.
When his brother Charles Spalding mysteriously dies, Harry Spalding and his wife Valerie decide to move to the inherited cottage in a small village in the country. They are coldly received by the locals, with the exception of the bartender and owner of a pub Tom Bailey, who welcome them. His weird neighbor Dr. Franklyn, who lives with his beautiful daughter Anna, tries to persuade them to sell the house and leave the place, but the couple decides to stay. Harry and Valerie find that the locals are being killed by some snake and they feel threatened. When Anna asks for help and they trespass Dr. Franklyn's house, they find the horrible truth hidden in the place.
In the early 20th century, a Gorgon takes human form and terrorizes a small European village by turning its citizens to stone.
A 12-year-old orphan who has just inherited a fortune is trapped on an island with his uncle, a former British intelligence commander who intends to kill him. A young girl is the boy's only ally against the sarcastic uncle, who uses hypnotism, a pool of sharks, fire, and poisonous mushrooms as weapons.