Crystal Doors

Fourteen-year-old cousins Gwen and Vic have lived together ever since the mysterious deaths of Gwen's parents and the disappearance of Vic's mother. But Vic's scientist father accidentally transports them through a magical crystal door to the island of Elantya. Cobblestone streets and silver towers mark the picturesque island, a trading hub and center of knowledge that runs on advanced physics and sorcery.

Gwen and Vic are still celebrating their victory in the battle with the Merlons when they learn that Vic's father has finally made it through the crystal doors to the magical island of Elantya. But their victory is short-lived when they and their friends are kidnapped by their underwater enemies and taken beneath the sea. There, they learn of a scheme that could bring Elantya to ruins. Can they escape in time to save the island from destruction?