Tess enlists her biological father - a lovable slacker from the wrong side of the tracks - and the charming juvenile delinquent next door to help her come to grips with the death of her little sister.
After accepting a nannying job for a young girl named Sophie, Summer Pratt starts to notice just how peculiar she is, and how indifferent Sophie's parents are to her strange behavior.
A single mother signs up for self-defense classes from a handsome instructor. But he develops a frightening obsession with her and orchestrates an increasing deadly array of "tests" to see if she has truly learned from his lessons.