Chess has always been the protector over his younger siblings, Emma and Finn. They have been a happy family, just the three of them and their mom. Everything changes when reports of three kidnapped children reach them, and they're shocked by the startling similarities between themselves and these strangers. Before they can question their mom about it, she takes off on a sudden work trip. Puzzling clues left behind lead to complex codes, hidden rooms, and a dangerous secret that will turn their world upside down.