The Castle of Water and Woe by Steffanie Holmes

Severed hands, moving paintings and an erotic encounter in a priest hole, just another typical day for Maeve Crawford at Briarwood Castle.
With Maeve’s sister Kelly on her way from America and the fae threat looming ever closer, things at Briarwood are more desperate than ever. When the coven discover an old portrait of Maeve’s mother might hold a valuable clue to help them defeat the fae host, they travel to London to uncover its secrets.

Under the bright city lights. Maeve discovers more about the mysterious origins of her powers, and one by one her guys open up about the dark parts of themselves they’ve kept hidden. In this most desperate of times, every member of the Briarwood coven must confront their own demons in order to unleash the full potential of their magic.