When a group of aspiring screenwriters join a workshop held in an isolated country house, they find themselves prisoners of a perverse guru and they must write a perfect script or face torture and death.

Maybe something like "An aspiring screenwriter attends a writers retreat at an isolated cabin, and soon finds himself and his colleagues at the mercy of a sadistic guru intent on torturing them to death."

Work with it, see what happens.

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A story in a story (in a story?) idea can give this movie the edge but will be very difficult to pull off. Make it too complicated and nobody knows "where" is "where" and who? is who? and we are not able to identify with the characters anymore and therefore to root for them. Whatch out for this trap:

http://putlocker.is/watch-south-park-tvshow-season-14-episode-10-online-free-putlocker.html