Once upon a time, the kingdoms of Wales were rife with magic and conflict, and eighteen-year-old Mererid “Mer” is well-acquainted with both. She is the last living water diviner and has spent years running from the prince who bound her into his service. Under the prince’s orders, she located the wells of his enemies, and he poisoned them without her knowledge, causing hundreds of deaths. After discovering what he had done, Mer went to great lengths to disappear from his reach. Then Mer’s old handler returns with a proposition: use her powers to bring down the very prince that abused them both.

Effy Sayre has always believed in fairy tales. Haunted by visions of the Fairy King since childhood, she’s had no choice. Her tattered copy of Angharad—Emrys Myrddin’s epic about a mortal girl who falls in love with the Fairy King, then destroys him—is the only thing keeping her afloat. So when Myrddin’s family announces a contest to redesign the late author’s estate, Effy feels certain it’s her destiny. But musty, decrepit Hiraeth Manor is an impossible task, and its residents are far from welcoming.

1873. At an abandoned château on the outskirts of Paris, a dark séance is about to take place, led by acclaimed spiritualist Vaudeline D’Allaire. Known worldwide for her talent in conjuring the spirits of murder victims to ascertain the identities of the people who killed them, she is highly sought after by widows and investigators alike. Lenna Wickes has come to Paris to find answers about her sister’s death, but to do so, she must embrace the unknown and overcome her own logic-driven bias against the occult.

Hazel Trépas has always known she wasn’t like the rest of her siblings. A thirteenth child, promised away to one of the gods, she spends her childhood waiting for her godfather—Merrick, the Dreaded End—to arrive. When he does, he lays out exactly how he’s planned Hazel’s future. She will become a great healer, known throughout the kingdom for her precision and skill. To aid her endeavors, Merrick blesses Hazel with a gift, the ability to instantly deduce the exact cure needed to treat the sick. But all gifts come with a price.

Every five years, two kingdoms take part in a Wild Hunt. Joining is a bloody risk, and even the most qualified hunters can suffer the deadliest fates. Still, hundreds gamble their lives to participate—all vying for the Hunt’s life-changing prize: a magical wish granted by the Otherking. A trickster, a prince, and a wild huntress—all in pursuit of the Champion’s prize. If they band together against the monstrous creatures within the woods, they have a chance to win. But nothing is guaranteed. After all, all are fair game in love and the Hunt.