Yankee journalist took an electric torch from his pocket, and the priest held it close to the middle part of the blade, which he examined with blinking care. Then, without glancing at the point or pommel, he handed the long weapon to the doctor.
"I fear I'm no use here," he said, with a brief sigh. "I'll say good night to you, gentlemen." And he walked away up the dark avenue towards the house, his hands clasped behind him and his big head bent in cogitation.
The rest of the group made increased haste towards the lodge-gates, where an inspector and two constables could already be seen in consultation with the lodge-keeper. But the little priest only walked slower and slower in the dim cloister of pine, and at last stopped dead, on the steps of the house. It was his silent way of acknowledging an equally silent approach; for there came towards him a presence that might have satisfied even Calhoun Kidd's demands for a lovely and aristocratic ghost. It was a young woman in silvery satins of a Renascence design; she had golden hair in two long shining ropes, and a face so startingly pale between them that she might have been chryselephantine—made, that is, like some old Greek statues, out of ivory and gold. But her eyes were very bright, and her voice, though low, was confident.
"Father Brown?" she said.
"Mrs Boulnois?" he replied gravely. Then he looked at her and immediately said: "I see you know about Sir Claude."
"How do you know I know?" she asked steadily.
He did not answer the question, but asked another: "Have you seen your husband?"
"My husband is at home," she said. "He has nothing to do with this."
Again he did not answer; and the woman drew nearer to him, with a curiously intense expression on her face.
"Shall I tell you something more?" she said, with a rather fearful smile. "I don't think he did it, and you don't either." Father Brown returned her gaze with a long, grave stare, and then nodded, yet more gravely.
"Father Brown," said the lady, "I am going to tell you all I know, but I want you to do me a favour first. Will you tell me why you haven't jumped to the conclusion of poor John's guilt, as all the rest have done? Don't mind what you say: I—I know about the gossip and the appearances that are against me."
Father Brown looked honestly embarrassed, and passed his hand across his forehead. "Two very little things," he said. "At least, one's very trivial and the other very vague. But such as they are, they don't fit in with Mr Boulnois being the murderer."
He turned his blank, round face up to the stars and continued absentmindedly: "To take the vague idea first. I attach a good deal of importance to vague ideas. All those things that 'aren't evidence' are what convince me. I think a moral impossibility the biggest of all impossibilities. I know your husband only slightly, but I think this crime of his, as generally conceived, something very like a moral impossibility. Please do not think I mean that Boulnois could not be so wicked. Anybody can be wicked—as wicked as he chooses. We can direct our moral wills; but we can't generally change our instinctive tastes and ways of doing things. Boulnois might commit a murder, but not this murder. He would not snatch Romeo's sword from its romantic scabbard; or slay his foe on the sundial as on a kind of altar; or leave his body among the roses, or fling the sword away among the pines. If Boulnois killed anyone he'd do it quietly and heavily, as he'd do any other doubtful thing—take a tenth glass of port, or read a loose Greek poet. No, the romantic setting is not like Boulnois. It's more like Champion."
"Ah!" she said, and looked at him with eyes like diamonds.
"And the trivial thing was this," said Brown. "There were finger-prints on that sword; finger-prints can be detected quite a time after they are made if they're on some polished surface like glass or steel. These were on a polished surface. They were half-way down the blade of the sword. Whose prints they were I have no earthly clue; but why should anybody hold a sword half-way down? It was a long sword, but length is an advantage in lunging at an enemy. At least, at most enemies. At all enemies except one."
"Except one," she repeated.
"There is only one enemy," said Father Brown, "whom it is easier to kill with a dagger than a sword."
"I know," said the woman. "Oneself."
There was a long silence, and then the priest said quietly but abruptly: "Am I right, then? Did Sir Claude kill himself?"
"Yes" she said, with a face like marble. "I saw him do it."
"He died," said Father Brown, "for love of you?"
An extraordinary expression flashed across her face, very different from pity, modesty, remorse, or anything her companion had expected: her voice became suddenly strong and full. "I don't believe," she said, "he ever cared about me a rap. He hated my husband."
"Why?" asked the other, and turned his round face from the sky to the lady.
"He hated my husband because… it is so strange I hardly know how to say it… because… "
"Yes?" said Brown patiently.
"Because my husband wouldn't hate him."
Father Brown only nodded, and seemed still to be listening; he differed from most detectives in fact and fiction in a small point—he never pretended not to understand when he understood perfectly well.
Mrs Boulnois drew near once more with the same contained glow of certainty. "My husband," she said, "is a great man. Sir Claude Champion was not a great man: he was a celebrated and successful man. My husband has never been celebrated or successful; and it is the solemn truth that he has never dreamed of being so. He no more expects to be famous for thinking than for smoking cigars. On all that side he has a sort of splendid stupidity. He has never grown up. He still liked Champion exactly as he liked him at school; he admired him as he would admire a conjuring trick done at the dinner-table. But he couldn't be got to conceive the notion of envying Champion. And Champion wanted to be envied. He went mad and killed himself for that."
"Yes," said Father Brown; "I think I begin to understand."
"Oh, don't you see?" she cried; "the whole picture is made for that—the place is planned for it. Champion put John in a little house at his very door, like a dependant—to make him feel a failure. He never felt it. He thinks no more about such things than—than an absent-minded lion. Champion would burst in on John's shabbiest hours or homeliest meals with some dazzling present or announcement or expedition that made it like the visit of Haroun Alraschid, and John would accept or refuse amiably with one eye off, so to speak, like one lazy schoolboy agreeing or disagreeing with another. After five years of it John had not turned a hair; and Sir Claude Champion was a monomaniac."
"And Haman began to tell them," said Father Brown, "of all the things wherein the king had honoured him; and he said: 'All these things profit me nothing while I see Mordecai the Jew sitting in the gate.'"
"The crisis came," Mrs Boulnois continued, "when I persuaded John to let me take down some of his speculations and send them to a magazine. They began to attract attention, especially in America, and one paper wanted to interview him. When Champion (who was interviewed nearly every day) heard of this late little crumb of success falling to his unconscious rival, the last link snapped that held back his devilish hatred. Then he began to lay that insane siege to my own love and honour which has been the talk of the shire. You will ask me why I allowed such atrocious attentions. I answer that I could not have declined them except by explaining to my husband, and there are some things the soul cannot do, as the
