Stagefright. 1987.
An escaped psychopath finds his way to a theatre and a group of actors rehearsing for a show become his intended victims.
After a slow character build up which makes us care about the stage actors this film goes to non stop terror, Michele Soavi is able to build up quite a lot of suspense and claustrophobia being in a small place and nowhere to run to or hide without being found. This is one those films for me that gets better and better with every viewing.
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