From publisher blurb:
A 5th Edition Mini-Dungeon adventure for 4 characters of level 5
While delving the darkened passages of a dungeon, occasions to rest and resupply are precious. Is it then any surprise that fell creatures turn such opportunities into bloody horror? A shelter mimic, disguised as a section of dungeon, lures in wandering monsters, explorers and adventurers with offers of safe rest and resupply. A rare specimen of mimic, the creature disguises itself as a house, cave, or in this case, a collection of dungeon chambers.