Follow Jack Ralston and his pal "Perk"--famous air pilots--as they help Uncle Sam unravel baffling problems of the Secret Service. The adventures of these two detective aviators are part of a series, although each book is a complete story in itself. CONTENTS Ready for the Takeoff The Luck of Scotty Headed South The Grim Pursuer A Duel in the Air Parachute Jumpers Striking the Fog Belt New Orleans, First Stop Coaching Perk Laying Plans The Night Alarm Playing with Fire The Hop-Off Skirting the Gulf Perk as a Fire Fighter In the Grip of the Storm A Fight Well Won The Deserted Shack Fortune Knocks at the Door Springing the Trap Picking Up Clues Over Arizona Deserts On to the Colorado Simeon Grows Desperate The Stage Set for Battle On the Face of the Moon The Sierra Madre Chain Close to the Tiger's Lair Nearing the Goal Jack Gets His Man