
We soon realize why - she is the little boy’s sister and grew up in the same house with their nutty mother.

Then there is Teresa Palmer as Rebecca, a young woman who has confidence and strength but a real problem when it comes to emotional commitment. Then he sees that no, Mom is actually talking to something that is there, that is evil and that wants to kill him. At first, the boy thinks Mom is talking to herself all night, which would have been bad enough.

But the boy’s real problem is that his mother - an increasingly wiggy Maria Bello - is entertaining a malicious evil spirit. Martin ( Gabriel Bateman) is a little boy whose father recently died. “Lights Out” presents actual characters that are interesting, that have rough edges, that act like real people, not victims in waiting. Instead some things are left mysterious, for us to fill in according to our own understanding of the moral universe. There isn’t a pat explanation for what is going on. Just a few random bad things, common to modern horror movies, that “Lights Out” doesn’t do: There is no stupid misuse of the soundtrack, with thunderous chords crashing down and making everybody jump. And you’d be amazed at the power outages that happen when she’s around. But in the shadows, she terrorizes, claws and devours. Turn on all the lights, and she’s gone (the thing is female).

The gimmick here is that there is a monster of some kind - an evil spirit, a psychological emanation, something bad for sure - that only has power in darkness. It’s even better when that idea is essentially visual.
