Tempest has a seemingly perfect life. She has a loving family, the perfect boyfriend and a group of friends surrounding her. But there's something peculiar about Tempest. Her mother is a mermaid who has left the family to pursue life under the ocean. Tempest will have to make a decision, and quickly. A mermaid's seventeenth birthday marks the time when she makes life-changing choices. She must choose to either stay as a human or follow in her mother's footsteps. She finds a desperate craving to give herself to the water, but fights it harder and harder each day. As her seventeenth birthday approaches, Tempest meets Kona, an extremely talented surfer. His amazing abilities on the water hint of non-human powers, but is it a trap for Tempest? Her birthday creeps nearer, and she's more lost than ever.