Tom Swift and his Polar-Ray Dynasphere

An unidentified rocket ship crashes into the Swifts' outpost in space and vanished before Tom can track it down. Shortly after comes the startling news that a Mars probe rocket, vital to the United States space program, has failed to respond to signals to bring it back to earth. Tom is confident that with his latest invention the Polar-Ray Dynasphere he can retrieve the stranded missile. But a web of espionage threatens his plan. A clue to the solution of the mystery prompts Tom to accept an invitation from the young Prince Jahan to visit his native land of Vishnapur in the snow-peaked Hi…