HOUSE OF LEAVES

A family moves into a house which appears to getting increasingly bigger inside, although the outside of the house stays the same. Doors appear where there were once blank walls, including a closet which stretches back several hundred feet into a seemingly endless black cavern. The characters get some flashlights and spelunking gear and head into the closet to investigate.

Second summary: A middle-aged man makes a documentary about his creepy house, an old man writes a book about the documentary about the house, and a young man writes his own notes in the book about the documentary about the house.

First Sentence:
“This is not for you.”