The Griffon is in the air to solve another high flying mystery. When is a good dollar counterfeit? That was only one of the baffling riddles that faced Kerry Keen after he attended that fashionable night club—by request. Sure, bad money is queer, but some things are a lot queerer—getting offered half a million bucks just for putting on a 200-mile air express act, for instance. Certainly, that was one for the book. And as for the silk-hatted man of mystery who had invaded Graylands—well, that was already in the book!

• Download “Rip-Cord Ruse” (May 1940, Flying Aces)