"In the sweltering summer of 1915, Pin, the fourteen-year-old daughter of a carnival fortune-teller, dresses as a boy and joins a teenage gang that roams the famous Riverview amusement park, looking for trouble. Unbeknownst to the well-heeled city-dwellers and visitors who come to enjoy the midway, the park is also host to a ruthless killer who uses the shadows of the dark carnival attractions to conduct his crimes.