The Mystery of the 15 Sounds is a juvenile mystery novel similar to The Hardy Boys written in the 1930's. Roger works in his uncle Grover's laboratory. The laboratory does research for various companies and scientists. As a result of a bizarre series of events, Roger becomes involved in a mystery surrounding a missing sacred Tibetan jewel. Using science, Roger and his uncle solve the mystery and nab the bad guys in a scene straight out of a Scooby Doo mystery.
The author writes in a note before the story begins:
Very entertaining and a great garage sale find.