Seraphina perishes in her first life after her duplicitous sister manipulates Prince Castian into executing her beneath the waves. Given a second chance at life, Seraphina renounces her shallow royal betrothed and plunges into the forbidden abyssal trenches of Atlantis. There rules a terrifying sovereign rumored to be an untamable sea monster, who reveals himself as Poseidon, the primordial lord of the oceans.
Instead of slaying her, Poseidon senses the dormant divine bloodline running through Seraphina's veins and offers her an alliance. As their bond deepens into passionate reverence, Seraphina awakens ancient siren calls capable of commanding the Kraken and colossal leviathans. When Castian and her treacherous sister launch an oceanic crusade against Atlantis, Seraphina stands beside Poseidon to unleash the ocean's fury.
