I remember the cover of the book being black and dark green. The story followed a man, I think he gets lost somehow & ends up at this weird house in the middle of nowhere. He is invite in for dinner, but everything they’re eating is cover in maggots. He gets up to excuse himself, and gets lost in this maze house.. he is in the basement and the homeowner? Or the son of homeowner? Finds the guest in the basement & traps him. The guest keeps opening doors that only lead to more doors.
Lost Classics of Teen Lit: Name That Book! 