In this conclusion to the City of Villains trilogy—blending flavors of Once Upon a Time, Gotham, and Serena Valentino's Villains series—teen detective Mary Elizabeth embraces her villainous side . . . and the Disney Villains’ surprising origin stories are revealed.

The Villains have taken over Monarch City, and Mary Elizabeth Heart has finally joined them. When different factions begin vying for the control of magic, Mary must question where her loyalties lie—and what everyone’s motives really are.

As the Villains band together to wage one last epic battle against the corrupt forces who made them villains in the first place, the very fabric of the world starts to unravel. It soon becomes clear that Mary can’t hide from her demons, and that her real destiny as a fairy tale villain is only just beginning.