In an ancient Wales that never was....
The twin brothers Emyr and Idrys are cursed to live as hounds: Emyr by night, and Idrys by day. The twins believe they will be trapped this way forever, until they meet the fierce and curious Áine, a changeling woman born with fey blood and gifts struggling to fit into a suspicious human world. Áine unravels the fate of Emyr and his twin as all three of them fall in love.
To free her lovers from the curse, she embarks on a journey to the realm of the fey where she confronts her own unique gifts and heritage. Ultimately, she must decide where her heart truly lies and what she's willing to risk to get what she desires most.