Leviathan’s Song by Elsie Winters

Elara is well versed in creating beautiful things with the potential for great destruction, and the moment she meets Levi she knows that’s exactly what he is. Charmed and irritated by the seductive siren, Elara is drawn to him, but though his siren song pulls her in, his words push her away.
As a landlocked half-merman, rejected by his people, Levi is used to wanting things he can never have, and the soft-hearted and strong-willed Elara just hit the top of that list. She’s tempting, and that’s dangerous for him.
He should stay away.
But when an underwater city’s distant war comes to Elara’s doorstep, she’s suddenly in over her head, and Levi can no longer bear to keep his distance. Can she trust the mercurial siren that calls to her with more than his voice?