"Did you find your knife, Bob?" "No such good luck, Frank." "That's kind of queer, isn't it?" "I'm beginning to think so myself," and Bob Archer looked meaningly at his chum, as though a suspicion might be forming in his mind to the effect that there was a practical joke back of it all; and that Frank Haywood really knew more about the missing article than he chose to admit. And yet, Frank, as a rule, was not given to pranks. "Did you go all over the ground where Ted Conway was teaching you yesterday how to pick up a handkerchief from the back of a galloping pony?" Frank continued. "Covered every foot of it, and more," replied Bob. "And still didn't find the knife you value so much?" persisted his chum.