Waking Nightmare (Hello Neighbor, Book 2)

It's been a month since Nicky Roth received a note from his best friend, Aaron Peterson. A month since that note went missing, in its place, a bloody handprint. And a month since Aaron and his little sister disappeared. Could Mr. Peterson, the theme park designer, be the one behind the kids' disappearance, or is Nicky knocking on the wrong door?