Mama (2010)

On the day that their parents die, sisters Lela and Valentina vanish in the woods, prompting a frantic search by their Uncle Logan (Ron Livingston) and his girlfriend, Alice (Amy Adams). Five years later, miraculously, the girls are found alive in a decaying cabin, and Logan and Alice welcome them into their home. But as Alice tries to reintroduce the children to a normal life, she finds that someone -- or something -- still wants to tuck them in at night.