From the author of Bitten comes an adult romantasy in which a magically bound mermaid and warlock must journey to the ocean's darkest depths to claim the fabled heart of the God of Death - if they can survive the wrath of their enemies . . . and each other.Mermaid Zephyra of the Syl dreams of freedom. On the run from a dangerous captor, she's swapped her tail for legs and hidden herself on land in the merrow-loathing kingdom of Mortia. But her freedom is short-lived when she's caught and sentenced to death by the brutal warlock, Arion Stone.Arion is as beautiful as he is cold and deadly, only interested in punishing the merrow he views as evil. He has grown as strong as any warlock might, but at great personal cost . . . which can only be remedied by the heart of the God of Death, lost to a fabled kingdom beneath the ocean's treacherous depths.So Arion offers Zephyra a deal she can't refuse: help him find the heart, and he'll spare her life. With no other options, Zephyra agrees, entangling their souls and forbidden desires in a magical bargain until death do they part. But Zephyra's past is catching up to her, and the enemy she fled seeks vengeance. If Zephyra and Arion can't learn to fight together - and trust each other - there are worse things awaiting them than just death . . .