The seas are stirring once more, and this time, they're calling Marina James by name.
After her first year at Atlantis High, Marina finally feels the calm after the storm. But peace beneath the waves never lasts long. When a forbidden chamber is mysteriously unlocked, haunting melodies drift through the corridors, songs said to awaken powers that should never resurface.
Drawn into the ocean's oldest riddle, Marina and her friends, Finn, Saphira, Goby, and Lyric, set out to uncover the truth behind the legendary "Song of the Deep." Each coral-etched clue pulls them further into danger, where light bends, loyalties shift, and nothing is as it seems.
As the tides of destiny rise, Marina must decide who she truly is: a girl caught between two worlds or the one chosen to unite them. In the moonlight above the waves, courage, friendship, and self-discovery become her compass and the sea her greatest teacher.