Jen has been looking for details since since her elder brother vanished. Theme park Bosco Bay, where he was last seen, is about to be demolished, but Jen couldn't shake the sensation that there is still something there that can shed light on her brother's whereabouts. But when Jen's cousin Allie stays with her family for the summer, her research becomes more challenging. Allie's mother sent her to assist Jen in coming to grips with her brother's disappearance, but soon Allie starts to share Jen's belief that her brother didn't simply vanish. And the reclusive Mr. Peterson, who designed theme parks, might just be aware of what transpired.