Over Sea, Under Stone

Three children on a holiday in Cornwall find an ancient manuscript which sends them on a dangerous quest for a grail that would reveal the true story of King Arthur and that entraps them in the eternal battle between the forces of the Light and the forces of the Dark.Vacationing in a seaside village in Cornwall, three children stumble upon a brittle old map showing the location of a magical relic of Arthurian days, leading them into a high-pitched battle of good and evil.