Since arriving at Shetland's Rock after the death of his father, David was introduced to the strange world of Druid Island, a land occupied by mythological gods and strange beasts. With the help of his mentor, Thomas, the son of the ancient magician Merlin, David defeated the evil sorceress Morgana, protected the underwater nation of Atlantis, saw to the destruction of the magical Book Of Spells, and dealt with the threat from the creatures known as the Deceivers. Even while trying to maintain a normal family life, the youngster still had to deal with the various witches who sought revenge for his actions against Morgana, as well as the vampire Valcord, who was determined to take control of Druid Island. His greatest challenged, however, still loomed before him in the form of the ancient Oracle who was visiting his dreams in order to take control of the boy who wielded the powerful trident that once belonged to the god Poseidon. In this fourth and final book, David searches for the Oracle while he continues to protect Druid Island as the young hero of the gods.