Jennifer, Julie, Laurie and Joe were perfectly normal siblings, that is, until their vacation to Paradise Island. When their love for adventure leads them to a new realm that they weren't meant to discover, the children find the fate of the world on their shoulders. Moreover, an unknown villain is lurking about, seeking power that the four can't even begin to imagine. Will they be able to save Earth with the help of their new friend? Or will the monster of the depths take over? With thrilling action and awe-evoking sceneries, little do the children know that they are about to embark on a journey that will change reality as they know it.