Based on Book?

"Is this movie actually based on a book?"

Who knows? This movie is great in any case... there's so much to read into, even if it crawls at a snail's pace [ The beautiful cinematography and lighting make up for that in spades ].

"Cain and Abel will go to Heaven... if they can make it through Hell!" -Los Hijos Del Topo

The story at times very much resembles Wuthering Heights.

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In heaven everything is fine.