the eighth gripping installment in the popular Ned and Nancy Mystery series! When a groundbreaking robot mysteriously disappears from the Maplewood High School Science Fair, the town is abuzz with questions and theories. Enter Nancy, a brilliant 12-year-old detective with a flair for the facts, and her best friend Ned, a 13-year-old with a wild imagination and a love for snacks. Together, they take on the challenge of tracking down the runaway robot and uncovering the truth behind its disappearance.