What was the name of this scary movie?!

I remember teenagers in a building, a 2 way mirror, a girl in shower with cross tat on back!. There was a man who was killing and his mother was behind it all!. She abused him his entire life!. I think he kept a girl in a cage at some point in the movie and at the end he kills his mother!?!?!? Www@Enter-QA@Com

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