Every book has a life of its own.

A rare book dealer finds himself at the heart of a string of paranormal events when he is hired to find the last two copies of a text, The Nine Gates of the Kingdom of Shadows, capable of summoning the Devil.
The Ninth Gate keeps every mind human — it fights its subject at zero distance. The story fights on E8/E9 of the E0–E14 reality ladder.
Films fighting at the same level of reality, about the same things.
The same preoccupations examined at another scale — one mind versus a nation.