She made one fatal mistake—believing she was the most dangerous creature in the ocean.

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Captured by the very myth she once hunted across the Northern Seas, Mer is forced to become a pawn in Ceto’s ruthless plan to destroy the human world above. To stop it, Mer has only one choice: submit, survive, and plot his downfall from within hist twisted court.

Above the waves, Methi is crumbling.

Raziel is losing his grip on both his people and his throne. With his queen missing, the Mirror Plague spreading, and civil war brewing, Raz must bury his pride and become something far more dangerous than a king—a villain.

But when fate drags them back together on the tide of a rising war, love becomes the most perilous battlefield of all because choosing each other could mean losing everything else.

And this time, they might not come back from the depths.