Brooke Summers had always loved the ocean. It was her therapy when everything else seemed to go wrong in her life. Though this changes when the ocean suddenly becomes the source of her problems. A couple weeks before her 21st birthday, Brooke's world is turned upside down when she is suddenly thrown into the Underwater world and into to a chaos rebellion. Fate has already decided that she will play a major role in stopping the chaos underneath the shore. In order to do so, she must undergo training with the handsome and majestic, Caspien, and the beautiful and ill-tempered, Zarya. Brooke has until her birthday to juggle the training of her destiny, adjusting to her new life, and a budding romance before the mad merman, Zephyr, takes over the Oceanus Kingdom.