Four children from Sevenoaks are taken to Tintagel, Cornwall to the same big house by the famous castle of Waelmore Fortress . Walking in a forest in Tintagel, Cornwall then go behind a waterfall in St Nectans Glen and find a cave- cauldron, potions, books, a diary, weapons, and a crown; then at the back, a door leading to a small room carved into the walls. Niamh has a past life, Evelyn and Tristan have each other, and no-one seems to know about Hunter A story of mystery and Celtic fantasies.