It's the first winter after the Monster Apocalypse. For Jack and his buddies, that means sled catapults, epic snowball battles, and one monstrous Christmas celebration. But their winter wonderland turns dark when a villainess begins hunting them. And this villainess is different-she's a human.

When the villainess steals Jack's prized monster-slaying tool, the Louisville Slicer, he vows to get it back. But it won't be easy. Jack and his friends soon discover that the Louisville Slicer is the key to a dark plan that threatens the entire world-and beyond...