Identical twins Jace and Jem Chamberlain, born of the Breedline species (a race of humans that have special powers and the gift to change into wolf form) finds their lives changed forever after their mothers murderer, the Chiang-shih demon, is finally destroyed, freeing their evil half brother, Sebastian Crow, of his possession.
With anger still an unquenchable fury that fuels his beast, Jace has a score to settle with Sebastian, who has managed to escape unscathed once again. As Tessa and Jace prepare for a future together, he continues to have reoccurring nightmares of her death.

Now that there is a bit of peace in the Breedline Covenant, Jem looks forward to marrying his beloved, Mia. Unprepared for the pregnancy of EveMias twin sisterthey must come to terms that Sebastian or the demon might have spawned Eves unborn children.

As the Breedline species prepare for a normal life without the corruption of the Chiang-shih demon, new life inhabits the covenant, bringing with it a whole new set of sinister deeds.

The question is, will Jace and his twin brother, Jem, be prepared for what might drive them to the brink of madness, or will they welcome the new arrivals?