Emelie

(2015)****

A parent's worst nightmare, here's how it's set up. Girl & her accomplice kill the babysitter before she is picked up by the parents. Dad picks up murderous girl instead thinking she is the babysitter. Mom & Dad kiss the kids and go off to have a lovely anniversary dinner unknowingly leaving a psychopath with their kids. She does all the things a sitter would do, plays games with them, watches a movie even reads a bedtime story but it's not so nice, the games are twisted, the movie is inappropriate and that's really putting it mildly and the bedtime story is just disturbing. This film had me on the edge of my seat the entire time.
Here's the trailer: