The ferocious French import known as both Ils and Them has no interest in slowing down or wandering around. It offers only the barest hints of character development and it doesn't have time to bother with subplots, red herrings or extraneous characters. It's just a stripped-to-the-bone stalker thriller in which two unfortunate souls spend one hellacious night trying to evade something extraordinarily murderous. (Or maybe someone, but I don't want to spoil the flick for you.)
The flicks opens with a fairly conventional stinger: a teenage girl and her mother run afoul of something deadly after suffering a nasty car accident. From there we meet a sweet-natured young teacher who's just about to head off and spend the weekend with her boyfriend in a rather isolated (and massive) house. And once the lights go out for the night, the action is just getting started.