User summary: The Monster is a picture story and system-neutral scenario/ dungeon description combined.
From the cover and back cover
The Monster: The gruesome tale of a most terrible creature. A haunted house ready to catch anyone who enters.
Every year, on the darkest night, in the darkest forest, the Monster rises from its swamp to feed.
The Monster is a storybook and gameable dungeon crawl in one. It features a fully illustrated storybook about a monster hunting children on a dark and stormy night. Plus, after the storybook is a system-neutral dungeon crawl for any tabletop role play game. The dungeon crawl features:
Two full sized maps
57 room descriptions
Terrifying monsters to populate your game
Do you dare learn the true story of the Monster?