pursuit of criminals, he was very mild about their punishment. Since he had been supreme over French—and largely over European—policial methods, his great influence had been honourably used for the mitigation of sentences and the purification of prisons. He was one of the great humanitarian French freethinkers; and the only thing wrong with them is that they make mercy even colder than justice.
When Valentin arrived he was already dressed in black clothes and the red rosette—an elegant figure, his dark beard already streaked with grey. He went straight through his house to his study, which opened on the grounds behind. The garden door of it was open, and after he had carefully locked his box in its official place, he stood for a few seconds at the open door looking out upon the garden. A sharp moon was fighting with the flying rags and tatters of a storm, and Valentin regarded it with a wistfulness unusual in such scientific natures as his. Perhaps such scientific natures have some psychic prevision of the most tremendous problem of their lives. From any such occult mood, at least, he quickly recovered, for he knew he was late, and that his guests had already begun to arrive. A glance at his drawing-room when he entered it was enough to make certain that his principal guest was not there, at any rate. He saw all the other pillars of the little party; he saw Lord Galloway, the English Ambassador—a choleric old man with a russet face like an apple, wearing the blue ribbon of the Garter. He saw Lady Galloway, slim and threadlike, with silver hair and a face sensitive and superior. He saw her daughter, Lady Margaret Graham, a pale and pretty girl with an elfish face and copper-coloured hair. He saw the Duchess of Mont St. Michel, black-eyed and opulent, and with her her two daughters, black-eyed and opulent also. He saw Dr. Simon, a typical French scientist, with glasses, a pointed brown beard, and a forehead barred with those parallel wrinkles which are the penalty of superciliousness, since they come through constantly elevating the eyebrows. He saw Father Brown, of Cobhole, in Essex, whom he had recently met in England. He saw—perhaps with more interest than any of these—a tall man in uniform, who had bowed to the Galloways without receiving any very hearty acknowledgment, and who now advanced alone to pay his respects to his host. This was Commandant O'Brien, of the French Foreign Legion. He was a slim yet somewhat swaggering figure, clean-shaven, dark-haired, and blue-eyed, and, as seemed natural in an officer of that famous regiment of victorious failures and successful suicides, he had an air at once dashing and melancholy. He was by birth an Irish gentleman, and in boyhood had known the Galloways—especially Margaret Graham. He had left his country after some crash of debts, and now expressed his complete freedom from British etiquette by swinging about in uniform, sabre and spurs. When he bowed to the Ambassador's family, Lord and Lady Galloway bent stiffly, and Lady Margaret looked away.
But for whatever old causes such people might be interested in each other, their distinguished host was not specially interested in them. No one of them at least was in his eyes the guest of the evening. Valentin was expecting, for special reasons, a man of world-wide fame, whose friendship he had secured during some of his great detective tours and triumphs in the United States. He was expecting Julius K. Brayne, that multi-millionaire whose colossal and even crushing endowments of small religions have occasioned so much easy sport and easier solemnity for the American and English papers. Nobody could quite make out whether Mr. Brayne was an atheist or a Mormon or a Christian Scientist; but he was ready to pour money into any intellectual vessel, so long as it was an untried vessel. One of his hobbies was to wait for the American Shakespeare—a hobby more patient than angling. He admired Walt Whitman, but thought that Luke P. Tanner, of Paris, Pa., was more "progressive" than Whitman any day. He liked anything that he thought "progressive." He thought Valentin "progressive," thereby doing him a grave injustice.
The solid appearance of Julius K. Brayne in the room was as decisive as a dinner bell. He had this great quality, which very few of us can claim, that his presence was as big as his absence. He was a huge fellow, as fat as he was tall, clad in complete evening black, without so much relief as a watch-chain or a ring. His hair was white and well brushed back like a German's; his face was red, fierce and cherubic, with one dark tuft under the lower lip that threw up that otherwise infantile visage with an effect theatrical and even Mephistophelean. Not long, however, did that salon merely stare at the celebrated American; his lateness had already become a domestic problem, and he was sent with all speed into the dining-room with Lady Galloway on his arm.
Except on one point the Galloways were genial and casual enough. So long as Lady Margaret did not take the arm of that adventurer O'Brien, her father was quite satisfied; and she had not done so, she had decorously gone in with Dr. Simon. Nevertheless, old Lord Galloway was restless and almost rude. He was diplomatic enough during dinner, but when, over the cigars, three of the younger men—Simon the doctor, Brown the priest, and the detrimental O'Brien, the exile in a foreign uniform—all melted away to mix with the ladies or smoke in the conservatory, then the English diplomatist grew very undiplomatic indeed. He was stung every sixty seconds with the thought that the scamp O'Brien might be signalling to Margaret somehow; he did not attempt to imagine how. He was left over the coffee with Brayne, the hoary Yankee who believed in all religions, and Valentin, the grizzled Frenchman who believed in none. They could argue with each other, but neither could appeal to him. After a time this "progressive" logomachy had reached a crisis of tedium; Lord Galloway got up also and sought the drawing-room. He lost his way in long passages for some six or eight minutes: till he heard the high-pitched, didactic voice of the doctor, and then the dull voice of the priest, followed by general laughter. They also, he thought with a curse, were probably arguing about "science and religion." But the instant he opened the salon door he saw only one thing—he saw what was not there. He saw that Commandant O'Brien was absent, and that Lady Margaret was absent too.
Rising impatiently from the drawing-room, as he had from the dining-room, he stamped along the passage once more. His notion of protecting his daughter from the Irish-Algerian n'er-do-weel had become something central and even mad in his mind. As he went towards the back of the house, where was Valentin's study, he was surprised to meet his daughter, who swept past with a white, scornful face, which was a second enigma. If she had been with O'Brien, where was O'Brien! If she had not been with O'Brien, where had she been? With a sort of senile and passionate suspicion he groped his way to the dark back parts of the mansion, and eventually found a servants' entrance that opened on to the garden. The moon with her scimitar had now ripped up and rolled away all the storm-wrack. The argent light lit up all four corners of the garden. A tall figure in blue was striding across the lawn towards the study door; a glint of moonlit silver on his facings picked him out as Commandant O'Brien.
He vanished through the French windows into the house, leaving Lord Galloway in an indescribable temper, at once virulent and vague. The blue-and-silver garden, like a scene in a theatre, seemed to taunt him with all that tyrannic tenderness against which his worldly authority was at war. The length and grace of the Irishman's stride enraged him as if he were a rival instead of a father; the moonlight maddened him. He was trapped as if by magic into a garden of troubadours, a Watteau fairyland; and, willing to shake off such amorous imbecilities by speech, he stepped briskly after his enemy. As he did so he tripped over some tree or stone in the grass; looked down at it first with irritation and then a second time with curiosity. The next instant the moon and the tall poplars looked at an unusual sight—an elderly English diplomatist running hard and crying or bellowing as he ran.
His hoarse shouts brought a pale face to the study door, the beaming glasses and worried brow of Dr. Simon, who heard the nobleman's first clear words. Lord Galloway was crying: "A corpse in the grass—a blood-stained corpse." O'Brien at last had gone utterly out of his mind.
"We must tell Valentin at once," said the doctor, when the other had brokenly described all that he had dared to examine. "It is fortunate that he is here;" and even as he spoke the great detective entered the study, attracted by the cry. It was almost amusing to note his typical transformation; he had come with the common concern of a host and a gentleman, fearing that some guest or servant was ill. When he was told the gory fact, he turned with all his gravity instantly bright and businesslike; for this, however abrupt and awful, was his business.
"Strange, gentlemen," he said as they hurried out into the garden, "that I should have hunted mysteries all over the earth, and now one comes and settles in my own back-yard. But where is the place?" They crossed the lawn less easily, as a slight mist had begun to rise from the river; but under the