Eden Lake - 2008
A young couple on a romantic weekend break at a remote lakehouse, are terrorised by a group of vicious delinquents.

And

An American Crime - 2007

Gertrude Baniszewski, a divorced mother of several children, agrees to take care of two girls, Sylvia and Jennie, while their parents travel with a carnival. Though her eldest daughter is the real troublemaker, Gertrude vents all her bitterness and frustration on innocent Sylvia. Gertrude imprisons the girl in the basement and tortures her, eventually encouraging her children to follow suit.