From #1 New York Times bestselling author Scarlett St. Clair comes a holiday surprise set in the world of Hades and Persephone. The halls are decked.

The souls are caroling. And Hecate, Goddess of Witchcraft, is warding the Underworld against a Kallikantzaroi invasion. For years, she's kept the menacing gremlins at bay.

But this year, Hermes makes a mistake that could ruin Christmas for everyone in New Greece. Now, as Hades and Persephone prepare to celebrate Yuletide, the Underworld descends into chaos. Can the gods restore order before it's too late—or will their holiday be destroyed?