Ever since her older brother disappeared, Jen has been searching for answers. The ruins of Bosco Bay, the theme park where he was last seen, are due to be demolished any day now, but Jen can't let go of the feeling that a clue to her brother's fate still remains there. But Jen's investigation gets complicated when her cousin Allie comes to live with her family for the summer. Allie's mom has tasked her with helping Jen come to terms with her brother's disappearance, but soon Allie comes to believe what Jen does: Jen's brother didn't just run away. And the reclusive theme park designer Mr. Peterson might just know what happened to him.