Ireland, 1055. Eternally youthful, Étaín lives in dread of discovery. Tied to a marriage of convenience with an ambitious and cruel priest, she strives to keep her pagan long-life magic secret. And though she longs to break from his brutality, she dares not leave her eleven-year-old grandson in his clutches.

Befriending a younger and more open-minded holy man, the fae-touched woman nearly confesses her dangerous spellbinding truth. But when her jealous husband catches them and flies into a violent rage, she places the youngster in her friend's care and bolts into the night.

Alone and despairing, can Étaín pass on her legacy before she fades from the mortal world?