Sixth-grader Benjamin Pratt is dealing with entirely too many changes. His parents have recently separated, his dad is living on a sailboat, and now his historic, oceanfront school is scheduled to be demolished to make way for a massive amusement park. Ben is ready to just give up and let it happen, until the school's elderly janitor hands him a tarnished, engraved coin with his dying breath. That single coin unlocks a two-hundred-year-old secret: the school building does not actually belong to the town's greedy developers. It belongs to the children, and they have the legal right to defend it. Suddenly, Ben is thrust into a high-stakes race against time. Alongside his determined friend Jill and an unexpected tagalong named Robert, Ben must decipher a trail of historical clues hidden right in the school's architecture. Can a handful of sixth graders outsmart powerful adults and stop a multimillion-dollar real estate deal? Dive into this suspenseful mystery to find out.