Something is attacking and killing elders who possess ancient and magical knowledge. When her own family elders and those of the Crow tribe tell Aisling Lorrah she will have to confront the unknown threat, she is bewildered and terrified. Her journey will take her to familiar places in the Big Horn Mountains and less familiar destinations in Ireland. Realms of past and present define her role in this battle as she ventures out alone. Without the help of her teachers and mentors, Aisling draws upon what she knows and what she learns in order to face the shocking adversary on a battlefield unlike any other. Ultimately, what she has been taught is combined with her own mysterious gifts to bring this story to its final conclusion.