they were walking with quickening steps down the long sweep of road on the other side of the high crescent, Father Brown leading briskly, though in silence. At last he said with an almost touching vagueness, "Well, I'm afraid you'll think it so prosy. We always begin at the abstract end of things, and you can't begin this story anywhere else.
"Have you ever noticed this—that people never answer what you say? They answer what you mean—or what they think you mean. Suppose one lady says to another in a country house, 'Is anybody staying with you?' the lady doesn't answer 'Yes; the butler, the three footmen, the parlourmaid, and so on,' though the parlourmaid may be in the room, or the butler behind her chair. She says 'There is nobody staying with us,' meaning nobody of the sort you mean. But suppose a doctor inquiring into an epidemic asks, 'Who is staying in the house?' then the lady will remember the butler, the parlourmaid, and the rest. All language is used like that; you never get a question answered literally, even when you get it answered truly. When those four quite honest men said that no man had gone into the Mansions, they did not really mean that no man had gone into them. They meant no man whom they could suspect of being your man. A man did go into the house, and did come out of it, but they never noticed him."
"An invisible man?" inquired Angus, raising his red eyebrows. "A mentally invisible man," said Father Brown.
A minute or two after he resumed in the same unassuming voice, like a man thinking his way. "Of course you can't think of such a man, until you do think of him. That's where his cleverness comes in. But I came to think of him through two or three little things in the tale Mr. Angus told us. First, there was the fact that this Welkin went for long walks. And then there was the vast lot of stamp paper on the window. And then, most of all, there were the two things the young lady said—things that couldn't be true. Don't get annoyed," he added hastily, noting a sudden movement of the Scotchman's head; "she thought they were true. A person can't be quite alone in a street a second before she receives a letter. She can't be quite alone in a street when she starts reading a letter just received. There must be somebody pretty near her; he must be mentally invisible."
"Why must there be somebody near her?" asked Angus.
"Because," said Father Brown, "barring carrier-pigeons, somebody must have brought her the letter."
"Do you really mean to say," asked Flambeau, with energy, "that Welkin carried his rival's letters to his lady?"
"Yes," said the priest. "Welkin carried his rival's letters to his lady. You see, he had to."
"Oh, I can't stand much more of this," exploded Flambeau. "Who is this fellow? What does he look like? What is the usual get-up of a mentally invisible man?"
"He is dressed rather handsomely in red, blue and gold," replied the priest promptly with precision, "and in this striking, and even showy, costume he entered Himylaya Mansions under eight human eyes; he killed Smythe in cold blood, and came down into the street again carrying the dead body in his arms—"
"Reverend sir," cried Angus, standing still, "are you raving mad, or am I?"
"You are not mad," said Brown, "only a little unobservant. You have not noticed such a man as this, for example."
He took three quick strides forward, and put his hand on the shoulder of an ordinary passing postman who had bustled by them unnoticed under the shade of the trees.
"Nobody ever notices postmen somehow," he said thoughtfully; "yet they have passions like other men, and even carry large bags where a small corpse can be stowed quite easily."
The postman, instead of turning naturally, had ducked and tumbled against the garden fence. He was a lean fair-bearded man of very ordinary appearance, but as he turned an alarmed face over his shoulder, all three men were fixed with an almost fiendish squint.
Flambeau went back to his sabres, purple rugs and Persian cat, having many things to attend to. John Turnbull Angus went back to the lady at the shop, with whom that imprudent young man contrives to be extremely comfortable. But Father Brown walked those snow-covered hills under the stars for many hours with a murderer, and what they said to each other will never be known.
6
The Honour of Israel Gow
A stormy evening of olive and silver was closing in, as Father Brown, wrapped in a grey Scotch plaid, came to the end of a grey Scotch valley and beheld the strange castle of Glengyle. It stopped one end of the glen or hollow like a blind alley; and it looked like the end of the world. Rising in steep roofs and spires of seagreen slate in the manner of the old French-Scotch chateaux, it reminded an Englishman of the sinister steeple-hats of witches in fairy tales; and the pine woods that rocked round the green turrets looked, by comparison, as black as numberless flocks of ravens. This note of a dreamy, almost a sleepy devilry, was no mere fancy from the landscape. For there did rest on the place one of those clouds of pride and madness and mysterious sorrow which lie more heavily on the noble houses of Scotland than on any other of the children of men. For Scotland has a double dose of the poison called heredity; the sense of blood in the aristocrat, and the sense of doom in the Calvinist.
The priest had snatched a day from his business at Glasgow to meet his friend Flambeau, the amateur detective, who was at Glengyle Castle with another more formal officer investigating the life and death of the late Earl of Glengyle. That mysterious person was the last representative of a race whose valour, insanity, and violent cunning had made them terrible even among the sinister nobility of their nation in the sixteenth century. None were deeper in that labyrinthine ambition, in chamber within chamber of that palace of lies that was built up around Mary Queen of Scots.
The rhyme in the country-side attested the motive and the result of their machinations candidly:
As green sap to the simmer trees
Is red gold to the Ogilvies.
For many centuries there had never been a decent lord in Glengyle Castle; and with the Victorian era one would have thought that all eccentricities were exhausted. The last Glengyle, however, satisfied his tribal tradition by doing the only thing that was left for him to do; he disappeared. I do not mean that he went abroad; by all accounts he was still in the castle, if he was anywhere. But though his name was in the church register and the big red Peerage, nobody ever saw him under the sun.
If anyone saw him it was a solitary man-servant, something between a groom and a gardener. He was so deaf that the more business-like assumed him to be dumb; while the more penetrating declared him to be half-witted. A gaunt, red-haired labourer, with a dogged jaw and chin, but quite blank blue eyes, he went by the name of Israel Gow, and was the one silent servant on that deserted estate. But the energy with which he dug potatoes, and the regularity with which he disappeared into the kitchen gave people an impression that he was providing for the meals of a superior, and that the strange earl was still concealed in the castle. If society needed any further proof that he was there, the servant persistently asserted that he was not at home. One morning the provost and the minister (for the Glengyles were Presbyterian) were summoned to the castle. There they found that the gardener, groom and cook had added to his many professions that of an undertaker, and had nailed up his noble master in a coffin. With how much or how little further inquiry this odd fact was passed, did not as yet very plainly appear; for the thing had never been legally investigated till Flambeau had gone north two or three days before. By then the body of Lord Glengyle (if it was the body) had lain for some time in the little churchyard on the hill.
As Father Brown passed through the dim garden and came under the shadow of the chateau, the clouds were thick and the whole air damp and thundery. Against the last stripe of the green-gold sunset he saw a black human silhouette; a man in a chimney-pot hat, with a big spade over his shoulder. The combination was queerly suggestive of a sexton; but when Brown remembered the deaf servant who dug potatoes, he thought it natural enough. He knew something of the Scotch peasant; he knew the respectability which might well feel it necessary to wear "blacks" for an official inquiry; he knew also the economy that would not lose an hour's digging for that. Even the man's start and suspicious stare