Fae Tithe (Chronicles of the Cursed Courts Book 1) by Alicia Dingley

In Seelieland, the Fae demand a Tithe. They didn’t count on a mother’s fury - or a Merman’s vow. Sixteen-year-old Eleanor Neycur was meant to chart her own course. A final year of school, a future at sea, and a life beyond the limitations of her coastal village. But when the Seelie Court revives its ancient Tithe and claims her without warning, Eleanor is torn from everything she knows and thrown into a glittering world built on control, secrets, and servitude.

Back home, Helena Neycur’s world shatters. She has spent her life drawing a Circle
around those she loves, and protecting her daughter at any cost. Now, she must fight against a kingdom that sees humans as chattel - and she will not do it alone. Beneath the waves, Lance, the Merman Helena once saved and now loves, is bound by the laws of the sea. But for Eleanor, he will test every boundary of his limited reach, even if it means risking war between land and sea.

As Eleanor uncovers the truths hidden behind the Tithe and Helena gathers allies from both coast and current, mother and daughter are set on a collision course with the very heart of Seelieland’s power. And the Fae have never faced a storm like this one.

They took the wrong girl.
They underestimated her mother.
And the tide is turning