Washed-up history professor Lewis Birch takes his begrudging teenagers Zoe and Jack on a road trip to a conference in hopes of jumpstarting his career and reconnecting with his kids. But, when Lewis’s estranged father Stanley goes missing on a Lewis and Clark historical reenactment trek, Lewis is forced to make a family detour. The Birch family find themselves on a journey of discovery and connection as they make their own passage west.

A mysterious new girl arrives in posh suburban neighborhood and quickly sets out to terrorize the town. As she starts breaking into homes and torturing the occupants, they begin to realize that she isn’t just another girl next door.