No man has ever wielded the power of the green stone. Until one day, 16-year-old Jaxon creates one. His new abilities could be exactly what he needs to save his brother. To master the magic of the stone, Jaxon leaves his kingdom behind in search of a teacher. His path crosses with the fiery Quinn, a red stone bearer doing everything she can to protect the princess, her best friend. As a series of murders plague the kingdom, Jaxon and Quinn find themselves caught up in unraveling the truth behind the attacks. They soon stumble across long-hidden secrets that could throw the world as they know it into chaos.

After freeing a siren and a dire bear from the castle dungeons, Quinn flees the only home she's ever known. She heads south to try to find her friend—and rescue the princess. Trapped in Twelve Pools, Jaxon struggles to decipher the message Annabel gave him. He knows time is running out to cure his brother. While they both fight to save the people they love, the rumblings of war grow and they begin to realize there is more at stake than they could ever have imagined.

Trapped and alone, Jaxon is a prisoner of the bloodsucker. As the truth unravels around him, he’s forced to confront who he really is. Close behind, Quinn is leading a ragtag band of allies on a mission to rescue her friend. She soon realizes the Endless Sea is hiding more than just dangerous monsters. Jaxon and Quinn must race against sea and time to stop the bloodsucker before he destroys everything—and everyone—they care about.