Treachery in Outer Space by Carey Rockwell

The sixth book in the Grosset & Dunlap "Tom Corbett - Space Cadet" series. Shipmates Tom, Astro, and Roger are assigned to oversee an interplanetary race, but their destination, Titan, faces trouble - trouble in the very atmosphere. Will the intrepid space cadets be able to unveil this terrible treachery in time? - Summary by Rich Brown