R.L. Stine, Zach, Hannah and Champ thought their troubles were over when the book had closed; but the real terrors and dangers were only just getting started. A year had nearly gone by after Slappy's Revenge (Stine's bestseller comeback novel yet) and things have calmed down since. Things started taking a strange turn...
Since the recent monster invasion, things were just beginning to look up again. That was, until Stine realized they'd forgotten one monster: The Invisible Boy, who disappears outside of Madison and runs away to Horrorland, on the other side of a large forest. Now, they have to follow him into Horrorland in order to t...