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train, and not standing on the line in the tunnel, he can’t have waved that red light at the driver. How, then, did he know that the train would slow down? What would he have done if it hadn’t?”
    â€œOh, I’m not defending my theory. I only put it forward as a piece of speculative reasoning. But why shouldn’t he have a confederate in the tunnel, who worked the lights to slow down the train?”
    â€œNo!” exclaimed Arnold decidedly. “That won’t do. In spite of the station-master at Blackdown, I’m prepared to believe in the possibility of one man having slipped in or out of the tunnel unobserved. But you ask me to believe that one man got in, and two came out, and that’s going too far.”
    Merrion laughed. “My dear fellow, I quite agree with you,” he replied. “I told you that I wasn’t defending my theory. But doesn’t all this show the difficulty of forming any plausible theory to account for Saxonby having been murdered?”
    â€œI’ve felt that all along. But I’m bound to think of every possibility, no matter how remote.”
    â€œOf course you are. Well, let’s see what possibilities there are. We’ll assume that Saxonby was shot while the train was passing through the tunnel. He, or any one else, would naturally choose that time, since the report of the pistol would then be effectively drowned. But I don’t think we need assume that the slowing down of the train had any connection with the event. It may have been merely a coincidence, due to hallucination on the part of the driver.
    â€œCutting that out, then, two possibilities remain. The first is that Saxonby was murdered by Turner, the guard. He had plenty of opportunity, but no apparent motive. The second is, that the murderer was some other passenger in the coach, who returned quietly to his own compartment when the deed was done. And, in that case, you ought to be able to identify him. It seems that the only compartment with a single occupant was Saxonby’s. By questioning the twenty-four passengers whose names you have, you will be able to find out if anybody left his seat before the train reached the tunnel, and returned to it afterwards.”
    â€œI’m going to do that in any case, just as a precaution,” Arnold replied.
    â€œGood. And, while you’re on the subject of precautions, I wouldn’t dismiss the tunnel altogether. I would see the driver and fireman of the train, and try to find out whether they really saw those lights or not. If they admit that they were mistaken, well and good. If not, I would search the tunnel myself.”
    â€œDidn’t I tell you that it has been searched already?”
    Merrion shook his head. “Not really searched,” he said. “A party of men went through it, looking for a definite and easily noticeable object, a body. They wouldn’t have been on the look-out for anything less conspicuous, such as a first-class railway ticket, for instance. And if they had, they would not have attached any particular importance to it. And, while you were about it, I should have a look at those signal boxes, and satisfy myself that they really do command the approaches to the tunnel as thoroughly as the station-master makes out. I’d always rather see a thing for myself than rely on somebody else’s description of it.”
    Arnold seemed impressed. “I dare say you’re right,” he replied. “But if the tunnel is to be searched, it ought to be done as soon as possible. If I decide to do it, will you come with me?”
    â€œAnd imperil my life in the cause of justice? All right, I don’t mind.”
    â€œThen I’d better get back to the Yard and see about it,” said Arnold.

VI
    In the course of the following morning, Merrion was again rung up by the Inspector. “I’ve arranged with the company to see those railwaymen,” he said.