Sephina finds herself at a loss against the evil that rages inside her. She has no choice but to surrender to its will each night and do evil's bidding since being offered up as a sacrifice to save her tribe hundreds of years ago. During the day, when her will is her own, she tries to atone for all the evil she has done after discovering a power that could help her find redemption. Zara, a telepathic twin with the power to extract memories, helps Sephina and countless others find peace in the world not many know exists, including Det. Brayden O'Leary.

After an investigation of a Manhattan homicide leads Det. Brayden O'Leary to Sephina, he learns what she is capable of and what is truly at stake. Zara reveals Brayden's hidden past and in doing so exposes his dark secret, torn but determined to stay by Sephina's side. The final battle begins when the Fallen Brother makes Sephina betray those she loves and stand against them as the dark immortal he created her to be...