Having sacrificed his wings in a bid save humanity, fallen angel Armand has a bold plan to assassinate Presidential candidate Maximilian Blackstone. When things go awry and his partner Baruch is gravely injured, Armand fears that he will fail in his task and forever lose the chance to rejoin the angels in Heaven.

Theodora is a wraith, a woman who officially doesn't exist. She lives in the shadows, taking risks to earn the bounty placed on dangerous assassinations — bounty that buys the chance at a new life for those she loves. Captured when her latest hit goes horribly wrong, Theodora finds herself the prisoner of a strong, arrogant stranger.

Soon enough, these two solitary souls find their missions — and their hearts — entwined. But in their desperate attempt to save the world, will they be able to save each other?