In a Cornish village, various locals die from mysterious snake bites, but the coroner rules the deaths as heart attacks, until a family of newcomers starts an investigation.

Harry Spalding and his wife Valerie inherit a cottage in a small country village after his brother mysteriously dies. The locals are unfriendly and his neighbor Dr. Franklyn (a doctor of theology) suggests they leave. They decide to stay only to find that a mysterious evil plagues the community.—H P Holley

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.—Claudio Carvalho, Rio de Janeiro, Brazil