Derrière les murs (known as Behind the Walls in the US) is a French supernatural-thriller film written and directed by Julien Lacombe and Pascal Sid.

[2] The story is about a young writer, played by Laetitia Casta, who goes to the countryside in order to find inspiration.

There, she is haunted by nightmares and depressions while in the area young girls disappear without a trace.

[4] The United States theatrical release was set for the first trimester 2011 as Behind the Walls.

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