CHAPTER XII

Under Arrest “What’s that?” demanded the storekeeper abruptly, in response to Frank Hardy’s inadvertent exclamation. “Nothing,” answered Frank. “I was surprised—that’s all. You see, there was a robbery at the airport only a day or so ago.” “Another one, eh? Well, they oughta watch that place more careful, that’s all I can say. People won’t be sendin’ their letters by airplane if they think they’re goin’ to be stolen all the time.” “That’s a case for you fellows,” said Biff. Neither Biff nor Chet were aware of the d…