It doesn’t spoil the main story.

    His chiseled jaw and silver gaze, I’ve only ever gotten a glimpse of, haunts both my nightmares and my dreams. There’s a treaty between us and them; mere mortals and the ones who terrify but keep us safe. The contract demands that every year there’s an offering and this year I’ll walk across that stage presenting myself. We have no idea what to expect if they choose someone, they haven’t in generations. The only thing we know is that the ones they take belong to them forevermore. If chosen, you don’t come back, or so the story of the treaty goes. Gather and present yourself.This is the offering…… and I… belong to him.

    In the Kalahari Desert, a nun unearths evidence of a proto-human species and a deity called Older-than-Old. In Bosnia, something has been feeding upon the dead in a mass grave. So begins mankind’s most shocking realization: that the underworld is a vast geological labyrinth populated by another race of beings. Some call them "devils" or "demons." But they are real. They are down there. And they are waiting for us to find them…