The Hardy boys were sons of a celebrated American detective and from their father learned the particulars of a number of unusual crimes. They were fired with zeal to bring the criminals to justice, and during their hours from school, and during their vacation days, they followed up clues they unearthed themselves — aiding their parent very materially. Stories which are absorbing in the extreme. - Summary from the book jacket This is number nine of the "Original Ten" Hardy Boys books which have been regarded by some as the best of the series and the publisher, the Stratemeyer Syndicate. The boys prepare to graduate from high school and are witnesses to a suspicious airplane emergency landing. Soon they become involved with their father, the famous detective Fenton Hardy, in investing a theft ring only to be falsely accused and arrested. Bailed out by wealthy individuals that the boys had solved mysteries for in the past, the intrepid duo sets about to solve the thefts and clear their names. - Summary by James R Hedrick