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thing, you would find that if Davenant used A's shaving-soap, so did Brotherhood; if Brotherhood used B's tooth-powder, so did Davenant. There lay the real danger of detection. There was just the danger that somebody—shall we say, an interfering old don?—might hit upon the truth of the secret, and make investigations. Accordingly, those little traces must be obliterated. And they have been, for Davenant was careful to take them away with him. And so has the photograph, a photograph which, I suspect, had a duplicate in Brotherhood's house—you see, neither Brotherhood nor Davenant could live without it."

"But the collars and the socks? Surely nobody is so intimately wedded to one particular type of collar———"

"A blind. Davenant was to look as if he were packing up to go away, so he must take some clothes with him, not merely the shaving things."

"But the towel and the soap? Surely they were not necessary to complete the illusion?"

"No, they are even more significant. Davenant—don't you remember?—had rather darker eyebrows than Brotherhood. Quite easily done, of course, with paint. But you want something to wash it off with; and there are no corridors on the slow trains."

"Yes, but look here," objected Reeves, "why did he want to take all these things away with him on Monday?—it was on Tuesday he was timed to