In the midst of a heat wave punctuated by frequent rainstorms, people are losing their heads. Literally. Not only that, but their bodies are still walking, and attacking others. And to make matters worse, tiny, translucent, maggot-sized worms are falling from the skies like hail.

As uncanny violence threatens to take over the city, Linzy, Carter, and Joanna become fast friends and leave for points unknown, hoping to stay alive, hoping to outrun the Headless.