(first half) House of Leaves by Mark Z. Danielewski

Aim to stop reading around page 346, finishing 'The Minotaur: Navidson Record Chapters XII - XIII'. You may read more, depending on how you're reading the book.
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Neither Pulitzer Prize-winning photojournalist Will Navidson nor his companion Karen Green was prepared to face the consequences of the impossibility of their new home, until the day their two little children wandered off and their voices eerily began to return another story—of creature darkness, of an ever-growing abyss behind a closet door, and of that unholy growl which soon enough would tear through their walls and consume all their dreams. This is a book about a book about a film about a house that is a labyrinth.