Halloween is hella fun when you're a monster! Or at least it used to be, before those junior Helsings got in the way of Gwen and her friends. Now, on top of that, the whole town is in lockdown, with a curfew and everything.

Gwen thinks it's time to ditch suburbia and finally head to the Hallowlands. But Miles and Sloane are determined to save their "normie" holiday. The vampire and werewolf scramble to fulfill their sacred need to party. The plan: throw the most epic bash this town has ever seen . . . and then scare everyone who shows up!

But Gwen has plans of her own. Fed up with being told no, she decides to use her magic to break into the Hallowlands once and for all. And she quickly discovers it's as strange as she always dreamed, but also as dangerous as her friends have warned. Luckily, she soon meets a fellow witch who can be her guide through the bizarre land and also help level up her powers. But could it all be too good to be true? The fate of these three best friends' Halloween night hangs in the balance--but will it end in trick or treat?