Devil (2010)

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According to legend, the Devil from time-to-time takes on human form, gathering a group of people he wishes to torment, trapping them, and hiding amongst them, posing as one of them.
Stranded in a broken down elevator, 5 strangers are about to find out that some legends are true...

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I do love a claustrophobic film, and 5 people in an elevator certainly delivers on that front; combined with the idea that one of their ever decreasing number is a killer (Satan himself, no less) there's no shortage of tension, and the movie does a great job of keeping you guessing, right down to the end. As with all good whodunnits, you'll suspect each and every cast member at some point or another in the movies runtime.

5 Souls (2013)

Sam, a man so deep in depression he opens his day with a one player version of Russian Roulette, is investigating the building collapse which killed his wife and daughter.
After a bad reaction to some vaccinations, Noah falls into a coma. "Waking" he meets fallen angel, Yusef, who gives him a choice; die in the coma, or assist the angel by killing for him, that Yusef can get what he came for... 5 Souls.

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The Prophecy (1995)

As told (in universe) in a missing portion of the bible, a second war is raging in heaven. Many of the Angels have grown tired of the "talking apes", and long for the days when God favoured them above all others, the only way to end the war is to gain control of a black soul, the blackest soul that ever walked, before it is claimed by Satan.
Angels, Simon (Eric Stoltz), and Gabriel (Christopher Walken) have each come to to find
A one-time trainee and current police officer, Thomas, finds himself stuck in the middle when he investigates the death of a very strange John Doe...

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