For Tristan Hart, everything changes with one crashing wave. He was gone for three days. Sucked out to sea in a tidal wave and spit back ashore at Coney Island with no memory of what happened. Now his dreams are haunted by a terrifying silver mermaid with razor-sharp teeth. His best friend Layla is convinced something is wrong. But how can he explain he can sense emotion like never before? How can he explain he's heir to a kingdom he never knew existed? That he's suddenly a pawn in a battle as ancient as the gods. Something happened to him in those three days. He was claimed by the sea...and now it wants him back.

A storm is coming... The ocean is a vicious place. Deeper and darker than Tristan could have imagined. Beneath its calm blue surface, an ancient battle is churning—and no one is safe. In the quest for the Sea Throne, Tristan has already watched one good friend die. Now he must lead the rest on a dangerous voyage in search of the trident that will make him king. But while Tristan chases his destiny, the dark forces racing against him are getting stronger, and the sea witch of his nightmares is getting closer. Battling sea dragons and savage creatures of the deep, Tristan needs his friends' support. But they each have their secrets, and a betrayal will force Tristan to choose between his crown and his best friend Layla—the only girl he's ever loved.

This epic clash of sand and sea will pit brother against brother-and there can only be one winner In two days, the race for the Sea Court throne will be over-but all the rules have changed. The sea witch, Nieve, has kidnapped Layla and is raising an army of mutant sea creatures to overthrow the crown. Kurt, the one person Tristan could depend on in the battle for the Sea King's throne, has betrayed him. Now Kurt wants the throne for himself. Tristan has the Scepter of the Earth, but it's not enough. He'll have to travel to the mysterious, lost Isle of Tears and unleash the magic that first created the king's powerful scepter. It's a brutal race to the finish, and there can only be one winner.