Marissa Locks, newly appointed partner of the Grimm Agency, has a reputation for making a mess of magical matters—although causing Armageddon is a new low, even for her.

Marissa is due for a little happily ever after. After all, she did kill the evil Fairy Godmother, end a war, and snag a sweet promotion within the Fairy Godfather's magical-problem-solving Agency. But between maintaining a relationship with someone whose amorous advances can cause third-degree burns, dealing with a killer-poodle infestation, and helping her best friend, Princess Ari, learn to wield spells more powerful than curing a hangover, she’s not getting as much peace and quiet as she hoped.

When an enemy from her past appears to exact a terrible revenge, Marissa’s life goes from hectic to hell on earth. With Grimm inexplicably gone and Ari trapped by a sleeping spell, Marissa decides to fight fire with hellfire—and accidentally begins a countdown to the apocalypse.

With the end of days extremely nigh, Marissa will have to master royal politics, demonic law, and biblical plagues in a hurry—because even the end of the world can’t keep the Agency from opening for business.