Secret Agent on Flight 101
Franklin W Dixon
Paperback
(Armada Bks., July 30, 1981)
"Disappearing trick...Frank and Joe Hardy are in pursuit of Hexton, the Incredible Magician. Using his stage act as a cover, Hexton is working as a secret agent for UGLI--a powerful international spy ring. When their father is kidnapped during a magic show, the Hardy boys follow Hexton and his gang of jewel thieves to the flight to Scotland. But their daring plan to enter the magician's fortress-like castle leads to their imprisonment in its gloomy depths... Can they escape in time to foil Hexton's ingenious plans, and unmask the secret agent on Flight 101?