Alex has built a life with Nerissa, a Nerida who left her underwater world seventeen years ago to keep their son, AJ, safe. But now the secrets of Nerissa’s past are resurfacing—and they’re coming for AJ.

As he nears adulthood, AJ worries about college and an ordinary future. Yet his growing connection to the ocean draws him toward a hidden world filled with danger, power, and enemies determined to use him.

Meanwhile, Naia is awakening to abilities she barely understands. With her mother lost to grief and her father’s identity shrouded in mystery, she must uncover the truth before it destroys what remains of her family.

Caught between land and sea, love and loyalty, Alex, Nerissa, AJ, and Naia face a darkness that threatens to tear them apart. Can they stand together—or will fate pull them beneath the tide?