answered his guest. "I believe in Doomsday."
The prince turned from the window and stared at him in a singular manner, his face in shadow against the sunset. "What do you mean?" he asked.
"I mean that we here are on the wrong side of the tapestry," answered Father Brown. "The things that happen here do not seem to mean anything; they mean something somewhere else. Somewhere else retribution will come on the real offender. Here it often seems to fall on the wrong person."
The prince made an inexplicable noise like an animal; in his shadowed face the eyes were shining queerly. A new and shrewd thought exploded silently in the other's mind. Was there another meaning in Saradine's blend of brilliancy and abruptness? Was the prince—Was he perfectly sane? He was repeating, "The wrong person—the wrong person," many more times than was natural in a social exclamation.
Then Father Brown awoke tardily to a second truth. In the mirrors before him he could see the silent door standing open, and the silent Mr. Paul standing in it, with his usual pallid impassiveness.
"I thought it better to announce at once," he said, with the same stiff respectfulness as of an old family lawyer, "a boat rowed by six men has come to the landing-stage, and there's a gentleman sitting in the stern."
"A boat!" repeated the prince; "a gentleman?" and he rose to his feet.
There was a startled silence punctuated only by the odd noise of the bird in the sedge; and then, before anyone could speak again, a new face and figure passed in profile round the three sunlit windows, as the prince had passed an hour or two before. But except for the accident that both outlines were aquiline, they had little in common. Instead of the new white topper of Saradine, was a black one of antiquated or foreign shape; under it was a young and very solemn face, clean shaven, blue about its resolute chin, and carrying a faint suggestion of the young Napoleon. The association was assisted by something old and odd about the whole get-up, as of a man who had never troubled to change the fashions of his fathers. He had a shabby blue frock coat, a red, soldierly looking waistcoat, and a kind of coarse white trousers common among the early Victorians, but strangely incongruous today. From all this old clothes-shop his olive face stood out strangely young and monstrously sincere.
"The deuce!" said Prince Saradine, and clapping on his white hat he went to the front door himself, flinging it open on the sunset garden.
By that time the new-comer and his followers were drawn up on the lawn like a small stage army. The six boatmen had pulled the boat well up on shore, and were guarding it almost menacingly, holding their oars erect like spears. They were swarthy men, and some of them wore earrings. But one of them stood forward beside the olive-faced young man in the red waistcoat, and carried a large black case of unfamiliar form.
"Your name," said the young man, "is Saradine?"
Saradine assented rather negligently.
The new-comer had dull, dog-like brown eyes, as different as possible from the restless and glittering grey eyes of the prince. But once again Father Brown was tortured with a sense of having seen somewhere a replica of the face; and once again he remembered the repetitions of the glass-panelled room, and put down the coincidence to that. "Confound this crystal palace!" he muttered. "One sees everything too many times. It's like a dream."
"If you are Prince Saradine," said the young man, "I may tell you that my name is Antonelli."
"Antonelli," repeated the prince languidly. "Somehow I remember the name."
"Permit me to present myself," said the young Italian.
With his left hand he politely took off his old-fashioned top-hat; with his right he caught Prince Saradine so ringing a crack across the face that the white top hat rolled down the steps and one of the blue flower-pots rocked upon its pedestal.
The prince, whatever he was, was evidently not a coward; he sprang at his enemy's throat and almost bore him backwards to the grass. But his enemy extricated himself with a singularly inappropriate air of hurried politeness.
"That is all right," he said, panting and in halting English. "I have insulted. I will give satisfaction. Marco, open the case."
The man beside him with the earrings and the big black case proceeded to unlock it. He took out of it two long Italian rapiers, with splendid steel hilts and blades, which he planted point downwards in the lawn. The strange young man standing facing the entrance with his yellow and vindictive face, the two swords standing up in the turf like two crosses in a cemetery, and the line of the ranked towers behind, gave it all an odd appearance of being some barbaric court of justice. But everything else was unchanged, so sudden had been the interruption. The sunset gold still glowed on the lawn, and the bittern still boomed as announcing some small but dreadful destiny.
"Prince Saradine," said the man called Antonelli, "when I was an infant in the cradle you killed my father and stole my mother; my father was the more fortunate. You did not kill him fairly, as I am going to kill you. You and my wicked mother took him driving to a lonely pass in Sicily, flung him down a cliff, and went on your way. I could imitate you if I chose, but imitating you is too vile. I have followed you all over the world, and you have always fled from me. But this is the end of the world—and of you. I have you now, and I give you the chance you never gave my father. Choose one of those swords."
Prince Saradine, with contracted brows, seemed to hesitate a moment, but his ears were still singing with the blow, and he sprang forward and snatched at one of the hilts. Father Brown had also sprung forward, striving to compose the dispute; but he soon found his personal presence made matters worse. Saradine was a French freemason and a fierce atheist, and a priest moved him by the law of contraries. And for the other man neither priest nor layman moved him at all. This young man with the Bonaparte face and the brown eyes was something far sterner than a puritan—a pagan. He was a simple slayer from the morning of the earth; a man of the stone age—a man of stone.
One hope remained, the summoning of the household; and Father Brown ran back into the house. He found, however, that all the under servants had been given a holiday ashore by the autocrat Paul, and that only the sombre Mrs. Anthony moved uneasily about the long rooms. But the moment she turned a ghastly face upon him, he resolved one of the riddles of the house of mirrors. The heavy brown eyes of Antonelli were the heavy brown eyes of Mrs. Anthony; and in a flash he saw half the story.
"Your son is outside," he said without wasting words; "either he or the prince will be killed. Where is Mr. Paul?"
"He is at the landing-stage," said the woman faintly. "He is—he is—signalling for help."
"Mrs. Anthony," said Father Brown seriously, "there is no time for nonsense. My friend has his boat down the river fishing. Your son's boat is guarded by your son's men. There is only this one canoe; what is Mr. Paul doing with it?"
"Santa Maria! I do not know," she said; and swooned all her length on the matted floor.
Father Brown lifted her to a sofa, flung a pot of water over her, shouted for help, and then rushed down to the landing-stage of the little island. But the canoe was already in mid-stream, and old Paul was pulling and pushing it up the river with an energy incredible at his years.
"I will save my master," he cried, his eyes blazing maniacally. "I will save him yet!"
Father Brown could do nothing but gaze after the boat as it struggled up-stream and pray that the old man might waken the little town in time.
"A duel is bad enough," he muttered, rubbing up his rough dust-coloured hair, "but
