No one understands the fury of the ocean like Zoey.

Ten years ago, she lost her leg in a freak shark attack. The night after her sixteenth birthday, she has yet to accept her awkward prosthetic limb or the fact she will always be different. Wary of the sea, and its hidden threats, she ventures to a bonfire at the beach. She's mesmerized by its awesome power, wondering what she ever had to fear, until a rogue wave sweeps her into the cool, salty water.

Zoey believed mermaids were creatures of legend, characters in silly children's stories, but it's hard to ignore the captivating tail that's suddenly appeared, or the sense of finally being whole. She abandons her life on land in search of answers about who she really is and where she came from.

What she discovers is a kingdom full of intrigue and danger, as well as a royal father she never knew existed. Settling into her role as a mermaid princess, she learns her family is under attack, both on land and in the water. Raging storms swell up, threatening coastal cities, and sea levels rise practically overnight, endangering the lives of everyone she loves. Determined to stop the strange phenomena, Zoey becomes caught up in the race to track down what, or who, is responsible for the catastrophic events.

But, Zoey possesses another secret, one born of legend and more powerful than any mer or human can imagine.