The Woman from the Waves by Roslyn Sinclair

Six years ago, on a remote Scottish island, a mysterious woman saved Sister Madeleine Laurent from drowning. Now, after leaving her convent, Madeleine crosses the ocean again to find the rescuer who changed her life. Instead, her search is disrupted by Hæra North, a brazen, provocative local who stirs Madeleine’s repressed desires—and keeps a secret out of legend.

Hæra has one dream: to become the first female Stormhorse, a powerful leader in her clan of fearsome ocean horse spirits. To do so, she must capture, drown, and eat a worthy human. When she first saw Madeleine, she knew she’d found the one. So why did Hæra save her instead?

Now Madeleine’s back. All Hæra has to do is remain in human form, earn her woman’s trust, then devour her.

But Madeleine is awakening another kind of appetite…

The Woman from the Waves is an epic lesbian fantasy romance about the power of unleashed desire, the courage it takes to change, and a love so vast it spans the sea, earth, and sky.