There's a lengthy introduction to this tale, involving the set-up for a home-invasion story with a twist - the aggressors are in the house before the homeowners get there, and they are meticulous in their methods.
Director Adam Mason’s found-footage-type horror extols the truly frightening prospect of a stranger in your house. As viewers, we are privy to the family going about their daily business, sleeping - but we're unaware of the stalker's dark plans, and that's the worry. Anything is possible. The house has become his world. He is a further member of the family that no one sees.
Of course, inkeeping with horror stories, our good guys - particularly Dad Aaron (Jeremy Sisko) - are prone to illogicality, even stupidity that works against them, but succeeds in furthering the plot. I'm happy with that, because the result is so entertaining. The finale is particularly good; it manages to be shocking and satisfying.