"Quite true; the evidence is very slight. But then, it often is. Everything up to date turns on the question of the badge. Let me reconstruct a possible—only possible, mark you—story, based on the supposition that my badge theory is correct. A German who speaks English perfectly is given a nice warm uniform taken from a captured British officer. Then he is told to go over to the British lines and see what he can find out. He comes one night; perfectly easy; no trouble; until walking along the front line he meets another officer—alone: an officer of the same regiment as that whose uniform he is wearing. Unavoidable; in fact, less likely to raise suspicion with the frequent changes that occur if he goes to the same regiment than if he went to another. But something happens: either the other officer's suspicions are aroused, or the German does not wish to be recognised again by him. The trench is quiet; an occasional rifle is going off, so he does the bold thing. He shoots him from point-blank range—probably with a Colt. As he stands there with the dead officer in front of him, waiting, listening hard, wondering if he has been heard, he sees the two badges on the officer's coat. So, being a cool hand, he takes off the left one, puts it on his own coat, and disappears for a time. Quite easy; especially when the trenches are old German ones."
"Really, Major, you seem to have made a speciality of detective fiction. As you said, I suppose your theory is possible."
Jesson spoke casually, but his eyes for the first time
