I think that from a student's point of view a book with lesser pages seems more attractive than a thick book of a couple hundred pages.
Maybe you could start your lessons with short stories and work your way up to thicker books.
-I think Stephen King's Silver Bullet wasn't that long and a good read.
-The Woman In Black by Susan Hill might be good. It isn't that long, the movie adaptation is quite recent and stars Elijah Wood.
-H.P. Lovecraft's longest stories are around 150 pages long. His work contains a lot of fancy and old timey words. But it does seem to appeal to a lot of people and it's classic horror literature.
-The Midnight Meat Train from Clive Barker is a short story turned into a movie with Bradley Cooper. He's a famous actor so that might raise interest.
Good luck...
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