Chris and Lisa Mattson (Patrick Wilson and Kerry Washington) have just moved into their new suburban house when they become the target of their next-door neighbor. A stern, single father, this tightly wound LAPD officer (Samuel L. Jackson) has appointed himself the watchdog of the neighborhood. His nightly foot patrols and overly watchful eyes bring comfort to some, but he becomes increasingly harassing to the newlyweds. These persistent intrusions into their lives ultimately turn tragic when the couple decides to fight back.