he had the notion that because I am a clergyman I should believe anything. Many people have little notions of that kind."
"But I can't make head or tail of it," said the doctor. "You must really begin at the beginning."
"The beginning of it was a dressing-gown," said Father Brown simply. "It was the one really good disguise I've ever known. When you meet a man in a house with a dressing-gown on, you assume quite automatically that he's in his own house. I assumed it myself; but afterwards queer little things began to happen. When he took the pistol down he clicked it at arm's length, as a man does to make sure a strange weapon isn't loaded; of course he would know whether the pistols in his own hall were loaded or not. I didn't like the way he looked for the brandy, or the way he nearly barged into the bowl of fishes. For a man who has a fragile thing of that sort as a fixture in his rooms gets a quite mechanical habit of avoiding it. But these things might possibly have been fancies; the first real point was this. He came out from the little passage between the two doors; and in that passage there's only one other door leading to a room; so I assumed it was the bedroom he had just come from. I tried the handle; but it was locked. I thought this odd; and looked through the keyhole. It was an utterly bare room, obviously deserted; no bed, no anything. Therefore he had
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