Cassiel and her Mashhit unit are on a mission to find the element Astatine for the archangel Michael so they can turn the element into a pliable material which will defeat the Fallen angels, stopping their uprising against the heavens and their fight to take over the earthly realm.
Azael is on a mission to seduce an angel into giving him the Astatine element so that he can give it to the Legion of Fallen Angels. What he didn't think would happen was falling in love and finding his True Mate! On the earthly realm he must portray himself as a human which means his relationship is starting based on a lie...
Complications arise, suspicions are aroused, truths revealed; but will their love for each other be enough to get them through?