Ted and Philo are on their way to see a demonstration of Professor Valdmere’s Atomic Ray when they encounter a girl trying to find her way to a place called Langdon Prairie. She turns out to be none other than Peggy Valdmere who is searching for the Professor, her father, who has disappeared. The boys join Peggy in the hunt and find themselves in one dangerous situation after another as they work to solve the mystery of the Professor’s disappearance and to protect the secret of the atomic ray. [Suggest a different description.]
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