girl is held captive by father against monsters outside, but she is actually one of those creatures without knowing it

Kept locked inside the house by her father, 7-year-old Chloe lives in fear and fascination of the outside world, where Abnormals create a constant threat—or so she believes. When a mysterious stranger offers her a glimpse of what's really happening outside, Chloe soon finds that while the truth isn't so simple, the danger is very real.