Written and acted by sincere amateurs, produced by some exploitation monger, this is dull and hard to watch.
Not the worst movie ever, but at least schlock like _Plan 9 From Outer Space_ usually had a real actor or two. I'd recommend _A Thief In The Night_ only to hardcore ironists and hardcore Dispensationalists. I'm neither.
Don't believe me? Watch it for free (albeit sourced from poor VHS) here: http://www.archive.org/details/Thief-In-The-Night
Relevant links added mostly to reach IMDb's 10-line minimum: http://en.wikipedia.org/wiki/Dispensationalism http://www.dvdtalk.com/reviews/3199/thief-in-the-night-se-a/