Identical twins Jace and Jem Chamberlain, born of the Breedline species—a secret race of humans with the gift to change into wolf form—find their lives changed forever after the Chiang-shih demon is finally destroyed, freeing their evil half-brother Sebastian Crow of the demon’s possession.

As Sebastian moves on with his new life, evading punishment for his crimes against the Breedline, he uncovers a secret from his past, leading him down a dangerous path he hadn’t bargained for.

Meanwhile, Jace is fiercely determined to protect his beloved Tessa, who is pregnant with his twin sons, from Sebastian Crow and his recurring nightmares. Worried his dreams are visions of her death, Jace battles with the lesser of two evils: to seek revenge against his half-brother, or to surrender his fury before his thirst for vengeance destroys everything he loves.

Now that everyone in the Breedline Covenant looks forward to Jem and Mia’s wedding, a mysterious guest arrives unexpectedly with an extraordinary gift of healing. The question is… are they all prepared to deal with the unforeseen visitor’s dark past of running from a corrupt group of scientists obsessed with his rare abilities, or will they be driven to the brink of madness?