Under the Mountain

Teenage twins Rachel and Theo Matheson travel to Auckland to stay with relatives following their mother's sudden death, only to discover that a rift in their telepathic bond has developed between them. As they explore the volcanic lake and Wilberforce house, they uncover evidence of an alien presence and a sinister plot by the Wilberforces, a race of symbiotic organisms threatening the planet. With the help of enigmatic Mr. Jones, a last surviving member of a benevolent alien race, the twins must work together to stop the Wilberforces and save the world from destruction.