Eddie and Jon Marks are spending the summer holiday at Silver Lake in the USA, where their parents have bought a cabin next to a deserted old house. When Eddie befriends two other boys in the area, they tell him the amazing story of the old house, Jack ‘the Devil’ Devlin and bodies put in slabs of cement. When the boys set out to reveal the truth behind the story, they soon find themselves in the middle of a frightening adventure.