Great cast, great premise but the director needs to reestablish the value of details. The atmosphere was effectively set, the cast did a fantastic job (especially India Eisley) but the director just seemed to neglect the details which impact the overall story. I understand that the beauty of films is it is not restricted to reality but effectively creating a reality you want your audience to be drawn into, is all in the details. Such a wasted project. I saw another review entitled All atmosphere, no substance, perfectly sums it up.

It had indeed great potential. The main character is a loser. Pure and simple. She gets made fun of by pretty much everyone in the school except one guy. The same boy she likes but is banging her female friend.

Anyway, the alter ego thing in the mirror had the potential to be great. She completely changes personality and surprises everybody and do whatever her "sister" couldn't and maybe at the end she'd reveal that it was all her. She already had that fearless persona all along..

But no, she just turned into a psycho who killed pretty much everybody that spoke in the movie besides her mom, of course. The first one was the school bully. Apparently, she breaks his knee and then he just disappears from the movie.. I guess she could must some super strength cause she was able to get the guy twice her weight outta the lockerroom to whatever place she dumped him into... Don't forget her only female friend at the ice skating ring... she could barely move but her friend suddenly gets afraid of her super weird stare and starts running away and ouch, she trips and breaks her spine, I guess... lol

Like I said, it could've been great but it was just a tasteless bland alter ego killing with no purpose whatsoever.. she even killed the boy she always wanted.. just because he wanted to go to the police because they'd called him to ask further questions.. he wasn't gonna turn her in because he didn't know what she did.. and worse, the police knew nothing.. just following protocol, but it doesn't matter, he's gone..

Waste of a good plot to make something out of this movie.

The first part is excellent; touching, creepy, interesting and really very chilling at times. A mix of believable characters and relationships, very well acted. The stage is set perfectly, but unfortunately in the second half the violence somehow undoes the tension already established. It's as if they couldn't resist the temptation to overdo it. Less would have been much more. Rather than build on the psychological and atmospheric creepiness, they throw it away with a rather unimaginative, predictable story arc, where the very dramatic actions feel over the top, and lack impact. A shame, as this really could have been excellent. Nonetheless, worth a watch.