The Collector (The Collector, #1)

Josie always liked visiting her grandmother in the countryside. But when her mother loses her job in the city and they're forced to relocate along with Josie's sister, Annie, she realizes she doesn't like the country that much. Especially because Grandma Jeannie has some strange rules: Don't bring any dolls into the house. And never, ever go near the house in the woods behind their yard. Soon though, Josie manages to make friends with the most popular girl in the sixth grade, Vanessa. When Vanessa eventually invites Josie back to her house to hang out, Josie doesn't question it. Not even when Vanessa takes her into the woods, and down an old dirt road, toward the very house Grandma Jeannie had warned her about.
As Josie gets caught up in her illicit friendship with Vanessa, Annie is caught in the crossfire. What follows is a chilling tale of dark magic, friendship, and some verrrrrry creepy dolls.