The Stratemeyer syndicate used the pseudonym Victor Appleton when writing several series for boys including Tom Swift. Edward Stratemeyer did the original outlines for the series, which was published between 1910 and 1941. Tom Swift was a genius inventor. He specialized in techlogy especially related to transportation. Later the series was followed by the Tom Swift Jr. series. Tom Swift In Captivity, or, A Daring Escape by Airship, is Volume 13 in the original Tom Swift vel series published by Grosset & Dunlap. From Wikipedia, Tom Swift is approached by Mr. Preston, the owner of a circus, and begins to tell the story of Jake Poddington, Mr. Preston's most skilled hunter. As it turns out, Jake went missing just after sending word to Preston that Jake was on the trail of a tribe of giants, somewhere in South Africa. That was the last Preston has heard of Jake Poddington. Preston would like Tom to use one of his airships to search for Poddington, and if possible, bring back a giant for the circus.