"That won't wash," said the doctor aside to the priest. "That's out of the detective stories. I was the colonel's medical man, and I knew his body better than he did. He had very fine hands, but quite peculiar ones. The second and third fingers were the same length. Oh, that's the colonel right enough."
As he glanced at the brained corpse upon the ground the iron eyes of the motionless blacksmith followed them and rested there also.
"Is Colonel Bohun dead?" said the smith quite calmly. "Then he's damned."
"Don't say anything! Oh, don't say anything," cried the atheist cobbler, dancing about in an ecstasy of admiration of the English legal system. For no man is such a legalist as the good Secularist.
The blacksmith turned on him over his shoulder the august face of a fanatic.
"It's well for you infidels to dodge like foxes because the world's law favours you," he said; "but God guards His own in His pocket, as you shall see this day."
Then he pointed to the colonel and said: "When did this dog die in his sins?"
"Moderate your language," said the doctor.
"Moderate the Bible's language, and I'll moderate mine. When did he die?"
"I saw him alive at six o'clock this morning," stammered Wilfred Bohun.
"God is good," said the smith. "Mr. Inspector, I have not the slightest objection to being arrested. It is you who may object to arresting me. I don't mind leaving the court without a stain on my character. You do mind perhaps leaving the court with a bad set-back in your career."
The solid inspector for the first time looked at the blacksmith with a lively eye; as did everybody else, except the short, strange priest, who was still looking down at the little hammer that had dealt the dreadful blow.
"There are two men standing outside this shop," went on the blacksmith with ponderous lucidity, "good tradesmen in Greenford whom you all know, who will swear that they saw me from before midnight till daybreak and long after in the committee room of our Revival Mission, which sits all night, we save souls so fast. In Greenford itself twenty people could swear to me for all that time. If I were a heathen, Mr. Inspector, I would let you walk on to your downfall. But as a Christian man I feel bound to give you your chance, and ask you whether you will hear my alibi now or in court."
The inspector seemed for the first time disturbed, and said, "Of course I should be glad to clear you altogether now."
The smith walked out of his yard with the same long and easy stride, and returned to his two friends from Greenford, who were indeed friends of nearly everyone present. Each of them said a few words which no one ever thought of disbelieving. When they had spoken, the innocence of Simeon stood up as solid as the great church above them.
One of those silences struck the group which are more strange and insufferable than any speech. Madly, in order to make conversation, the curate said to the Catholic priest:
"You seem very much interested in that hammer, Father Brown."
"Yes, I am," said Father Brown; "why is it such a small hammer?"
The doctor swung round on him.
"By George, that's true," he cried; "who would use a little hammer with ten larger hammers lying about?"
Then he lowered his voice in the curate's ear and said: "Only the kind of person that can't lift a large hammer. It is not a question of force or courage between the sexes. It's a question of lifting power in the shoulders. A bold woman could commit ten murders with a light hammer and never turn a hair. She could not kill a beetle with a heavy one."
Wilfred Bohun was staring at him with a sort of hypnotised horror, while Father Brown listened with his head a little on one side, really interested and attentive. The doctor went on with more hissing emphasis:
"Why do these idiots always assume that the only person who hates the wife's lover is the wife's husband? Nine times out of ten the person who most hates the wife's lover is the wife. Who knows what insolence or treachery he had shown her—look there!"
He made a momentary gesture towards the red-haired woman on the bench. She had lifted her head at last and the tears were drying on her splendid face. But the eyes were fixed on the corpse with an electric glare that had in it something of idiocy.
The Rev. Wilfred Bohun made a limp gesture as if waving away all desire to know; but Father Brown, dusting off his sleeve some ashes blown from the furnace, spoke in his indifferent way.
"You are like so many doctors," he said; "your mental science is really suggestive. It is your physical science that is utterly impossible. I agree that the woman wants to kill the co-respondent much more than the petitioner does. And I agree that a woman will always pick up a small hammer instead of a big one. But the difficulty is one of physical impossibility. No woman ever born could have smashed a man's skull out flat like that." Then he added reflectively, after a pause: "These people haven't grasped the whole of it. The man was actually wearing an iron helmet, and the blow scattered it like broken glass. Look at that woman. Look at her arms."
Silence held them all up again, and then the doctor said rather sulkily: "Well, I may be wrong; there are objections to everything. But I stick to the main point. No man but an idiot would pick up that little hammer if he could use a big hammer."
With that the lean and quivering hands of Wilfred Bohun went up to his head and seemed to clutch his scanty yellow hair. After an instant they dropped, and he cried: "That was the word I wanted; you have said the word."
Then he continued, mastering his discomposure: "The words you said were, 'No man but an idiot would pick up the small hammer.'"
"Yes," said the doctor. "Well?"
"Well," said the curate, "no man but an idiot did." The rest stared at him with eyes arrested and riveted, and he went on in a febrile and feminine agitation.
"I am a priest," he cried unsteadily, "and a priest should be no shedder of blood. I—I mean that he should bring no one to the gallows. And I thank God that I see the criminal clearly now—because he is a criminal who cannot be brought to the gallows."
"You will not denounce him?" inquired the doctor.
"He would not be hanged if I did denounce him," answered Wilfred with a wild but curiously happy smile. "When I went into the church this morning I found a madman praying there—that poor Joe, who has been wrong all his life. God knows what he prayed; but with such strange folk it is not incredible to suppose that their prayers are all upside down. Very likely a lunatic would pray before killing a man. When I last saw poor Joe he was with my brother. My brother was mocking him."
"By Jove!" cried the doctor, "this is talking at last. But how do you explain——"
The Rev. Wilfred was almost trembling with the excitement of his own glimpse of the truth. "Don't you see; don't you see," he cried feverishly; "that is the only theory that covers both the queer things, that answers both the riddles. The two riddles are the little hammer and the big blow. The smith might have struck the big blow, but would not have chosen the little hammer. His wife would have chosen the little hammer, but she could not have struck the big blow. But the madman might have done both. As for the little hammer—why, he was mad and might have picked up anything. And for the big blow, have you never heard, doctor, that a maniac in his paroxysm may have the strength of ten men?"
The doctor drew a deep breath and then said, "By golly, I believe you've got it."
Father Brown had fixed his eyes on the speaker so long and steadily as to prove that his large grey, ox-like eyes were not quite so insignificant as the rest of his face. When silence had fallen he said with marked respect: "Mr. Bohun, yours is the only theory yet propounded which holds water every way and is essentially unassailable. I think, therefore, that you deserve to be told, on my positive knowledge, that it is not the true one." And with that the old little man walked away and stared again at the hammer.
"That fellow seems to know more than he ought to," whispered