What a pleasant, creepy surprise. Excellent acting (esp. from Jason Bateman, showing a dark side I didn’t know he had) and good direction. Despite a few implausibilities, the script starts out feeling familiar but then takes a few left turns that rivet your attention. (The trailer makes it seem like it’s going to be some cliched slasher film, but it’s anything but.) I don’t want to say anymore except that karma is a bitch.