In this ninth volume in the Motor Boys Series, The Motor boys in The Clouds, the boys have had very exciting and successful adventures on land and on the water, so a natural progression of their interests would turn to the skies. It is 1910, and while airships, that is, lighter-than-air aircraft had been under development since 1670, reliable commercial and military applications didn't occur until after 1900. The boys' airship, the Comet, is a combination airplane, with wings and engines, supported by a gas-filled balloon. Joined yet again by Professor Snodgrass and the Comet's designer and builder Rupert Glassford, they set off to win some flying prize money. Action in the skies!
Clarence Young was a Stratemeyer Syndicate pen name. Howard Garis probably wrote the series, although Stratemeyer usually provided his authors with an outline of the books. Garis and his wife, Lillian, wrote many children's books under their own name. They are best known for a series of books that featured the character of Uncle Wiggily Longears, an engaging elderly rabbit. Many of Garis' books were illustrated by Lansing Campbell. Garis and his wife, Lilian Garis, were possibly the most prolific children's authors of the early 20th century. Garis wrote many books for the Stratemeyers Syndicate as well, over a period of some 30 years.