Sin Undone Demonica Series, Book 5.

From the New York Times bestselling author who Gena Showalter calls "decadently sinful" comes a forbidden romance in the beloved Demonica series. As the only female Seminus demon ever born, master assassin Sinead Donnelly is used to being treated like an outcast. She spent decades enslaved, and now vows she'll die before she'll relinquish her freedom again. Then Sin's innate ability to kill her enemies goes awry: She creates a lethal new were...