British TV movie, made by Hammer Films for their second series "Hammer House of Mystery and Suspense", does a good job slowly building up the characters' fear without making it feel like things are moving at a snail's pace. Nearly all of its 70 minute run time is spent on the characters attempting various methods of escape and theorizing on who (or what) has trapped them and why.
Other occurrences soon indicate their predicament is even stranger than it appears, such as a mysterious slime oozing into one area of the house, characters suddenly losing feeling/use of a limb for no apparent reason, and total memory loss of major life events.
Always the pessimist, I fully expected the coda to all this to drop the ball. All I'll say is that it definitely does not. If you want to see something a little different and actually driven by its story (something increasingly rare) this is well worth checking out and a perfect example of how horror can best utilize the made-for-TV format.
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