Dr. Trina Parker flies to the island of Oahu for a medical conference. All she wants is for the conference to be over and to get some peace and quiet at the Lanikai beach house she rented for the week. On the first night of her stay, while taking a dip in the ocean, she gets caught underwater between two figures in a struggle - enemies, rivals, and mermen. Soon, Trina finds herself on an adventure of a lifetime. Journeys into the depths of the sea, secret cures, and an intimate relationship with a mythical creature, challenge all the science Trina has ever learned as fact. Will she choose the love of her life, her career, or get the best of both worlds?