Naomi is someone who has never thought that demons and the supernatural realm even existed, until the night of Halloween. She is haunted by a demonic presence and forced to see the reality of the truth.
He told her that she has opened up something evil, a portal to Hell. Even though it was by accident, now she is fully responsible to close the entrance, by sending the escaped Souls back in through it, and sealing the portal.
If she doesn't ... everyone she loved and cared for will be gone forever. This world is not used to seeing supernatural entities on a regular basis let alone just for a Halloween night. If they will not be contained they will take over the world.
(THIS IS PART OF THE "DarkFairytale" COLLECTION WHICH IS IN NO WAY RELATED WITH THE REST OF THE BOOKS IN THIS COLLECTION.)