Kindred Spirits

After Sadie moves back with her mother Chloe and teenage sister Nicole, she quickly begins attending high school parties with Nicole and inserting herself into Chloe's relationship with Alex, the father of Nicole's best friend and Chloe's sort-of secret boyfriend. She gets too close too quickly, and it gradually becomes apparent that maybe Sadie's motives aren't entirely innocent. (bloody-disgusting.com)