In 11th century Ireland, Étaín must hide her pagan magic from her pious Christian priest husband, Airtre. She wants to escape his physical abuse, but she must stay to protect their grandson, Maelan. Over many lifetimes, she has learned how to endure her own pain, but Maelan is young and vulnerable.

When Airtre's paranoia and jealousy spiral out of control, Étaín has no choice but to escape in the night with little more than the clothing on her back, leaving a trusted friend to protect Maelan.

This is not the first lifetime Étaín has fled, and she knows how to survive. But when her past comes back to haunt her, she must make decisions that may result in disaster for her, her grandson, and everyone she loves.