Thomas Trew and the Selkie's Curse

Someone has unleashed a deadly curse on the Hidden World. Can Thomas and his friends stop it?

Trouble is brewing in the underwater land of the selkies when a young sea girl is discovered unconscious in Owlchurch. She's been poisoned by a curse that's spreading throughout the sea world — a curse that must be stopped before it affects the whole Hidden World. When Thomas promises to help, he and his friends travel to the amazing land of the sea folk where they embark on an exciting adventure at the very depths of the ocean.