"I don't believe it."
   "I can prove it."
   " How ? '
   Biggles took an envelope from his pocket, and from it produced a small square photograph such as is taken by a camera-gun. He held it up. In the centre was a Hurricane. " Daby took that photograph," he said. "The pilot of the Hurricane knew nothing about it. I think you will agree that if Daby had been a Hun the pilot of that Hurricane would never have known what killed him."
   "Who was in the Hurricane ? "
   "Taggart."
   "But Taggart was only a beginner," protested Wilkinson. Daby would never have pulled off a shot like that if the Hurricane pilot had been an old hand."
   Biggles smiled faintly and took out a second photograph. "This also is a direct hit," he said quietly, Another Hurricane. Again the pilot didn't suspect he was being shot at—
   although he was an old hand."
   Wilkinson almost snatched the photograph. His lips parted in horror and surprise. "I know that machine," he stammered.
   "You ought to," Biggles told him grimly. "You were flying it. You'll agree, I think, that if Daby was able to score a hit on a pilot of your experience, without you knowing anything about it, he hasn't been wasting his time."
   Wilks bit his lip. "I can see I shall have to watch my step," he said sadly.
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 41 Biggles Takes The Case Page 17