Young Jack Burrows leads a peaceful life with his uncle and aunt in a quiet Cornish seaside village - until a mission to retrieve a lost phone from an old well leads him and his friend Ryan to the discovery of some strange green worm-like creatures, trapped inside the stones of the well. After releasing them, the boys join forces with a winged alien to fight a terrible beast they have created. A thrilling story of shape-shifters, invisible forces and battles in the dark.