A young sorceress, Margret, reveals the cloud is a Night Mare—a sinister horse when on land and a menacing storm in the sky. Margret can track Jamie using ancient blood magic and offers her help. Pippa learns the sorceress is lying about her true identity, but using Margret’s powers might be the only way to save her brother.
Pippa steals Viking longship and embarks with an unlikely crew. Some are her friends, others are strangers, and she suspects one hides a secret. While seeking answers in the Scottish Hebrides, Pippa unearths the cause for Jamie’s abduction: Kolruna, a Norse witch, blames Pippa’s family for the death of her lover and persecutes them in revenge.
Caught in a whirlwind of deception, Pippa must decide between relying on Margret’s obscure blood magic to face the Night Mare, or embrace the risk of finding Jamie alone, before the vengeful Kolruna hunts Pippa herself and she loses her brother forever.