Dr. van Heerden's surgery occupied one of the four shops which formed the ground floor of the Krooman Chambers. This edifice had been erected by a wealthy philanthropist to provide small model flats for the professional classes who needed limited accommodation and a good address (they were in the vicinity of Oxford Street) at a moderate rental. Like many philanthropists, the owner had wearied of his hobby and had sold the block to a syndicate, whose management on more occasions than one had been the subject of police inquiry.
They had then fallen into the hands of an intelligent woman, who had turned out the undesirable tenants, furnished the flats plainly, but comfortably, and had let them to tenants who might be described as solvent, but honest. Krooman Chambers had gradually rehabilitated itself in the eyes of the neighbourhood.
Dr. van Heerden had had his surgery in the building for six years. During the war he was temporarily under suspicion for sympathies with the enemy, but no proof was adduced of his enmity and, though he had undoubtedly been born on the wrong side of the Border at Cranenburg, which is the Prussian frontier station on the Rotterdam-Cologne line, his name was undoubtedly van Heerden, which was Dutch. Change the "van" to "von," said the carping critics, and he was a Hun, and undoubtedly Germany was full of von Heerens and von Heerdens.
The doctor lived down criticism, lived down suspicion, and got together a remunerative practice. He had the largest flat in the building, one room of which was fitted up as a laboratory, for he had a passion for research. The mysterious murder of John Millinborn had given him a certain advertisement which had not been without its advantages. The fact that he had been in attendance on the millionaire had brought him a larger fame.
His theories as to how the murder had been committed by some one who had got through the open window whilst the two men were out of the room had been generally accepted, for the police had found footmarks on the flowerbeds, over which the murderer must have passed. They had not, however, traced the seedy-looking personage whom Mr. Kitson had seen. This person had disappeared as mysteriously as he had arrived.
Three months after the murder the doctor stood on the steps of the broad entrance-hall which led to the flats, watching the stream of pedestrians passing. It was six o'clock in the evening and the streets were alive with shop-girls and workers on their way home from business.
He smoked a cigarette and his interest was, perhaps, more apparent than real. He had attended his last surgery case and the door of the "shop," with its sage-green windows, had been locked for the night.
His eyes wandered idly to the Oxford Street end of the thoroughfare, and suddenly he started. A girl was walking toward him. At this hour there was very little wheeled traffic, for Lattice Street is almost a cul-de-sac, and she had taken the middle of the road. She was dressed with that effective neatness which brings the wealthy and the work-girl to a baffling level, in a blue serge costume of severe cut; a plain white linen coat-collar and a small hat, which covered, but did not hide, a mass of hair which, against the slanting sunlight at her back, lent the illusion of a golden nimbus about her head.
The eyes were deep-set and wise with the wisdom which is found alike in those who have suffered and those who have watched suffering. The nose was straight, the lips scarlet and full. You might catalogue every feature of Oliva Cresswell and yet arrive at no satisfactory explanation for her charm.
Not in the clear ivory pallor of complexion did her charm lie. Nor in the trim figure with its promising lines, nor in the poise of head nor pride of carriage, nor in the ready laughter that came to those quiet eyes. In no one particular quality of attraction did she excel. Rather was her charm the charm of the perfect agglomeration of all those characteristics which men find alluring and challenging.
She raised her hand with a free unaffected gesture, and greeted the doctor with a flashing smile.
"Well, Miss Cresswell, I haven't seen you for quite a long time."
"Two days," she said solemnly, "but I suppose doctors who know all the secrets of nature have some very special drug to sustain them in trials like that."
"Don't be unkind to the profession," he laughed, "and don't be sarcastic, to one so young. By the way, I have never asked you did you get your flat changed?"
She shook her head and frowned.
"Miss Millit says she cannot move me."
"Abominable," he said, and was annoyed. "Did you tell her about Beale?"
She nodded vigorously.
"I said to her, says I," she had a trick of mimicry and dropped easily into the southern English accent, "'Miss Millit, are you aware that the gentleman who lives opposite to me has been, to my knowledge, consistently drunk for two months—ever since he came to live at Kroomans?' 'Does he annoy you?' says she. 'Drunken people always annoy me,' says I. 'Mr. Beale arrives home every evening in a condition which I can only describe as deplorable.'"
"What did she say?"
The girl made a little grimace and became serious.
"She said if he did not speak to me or interfere with me or frighten me it was none of my business, or something to that effect." She laughed helplessly. "Really, the flat is so wonderful and so cheap that one cannot afford to get out—you don't know how grateful I am to you, doctor, for having got diggings here at all—Miss Millit isn't keen on single young ladies."
She sniffed and laughed.
"Why do you laugh?" he asked.
"I was thinking how queerly you and I met."
The circumstances of their meeting had indeed been curious. She was employed as a cashier at one of the great West End stores. He had made some sort of purchase and made payment in a five-pound note which had proved to be counterfeit. It was a sad moment for the girl when the forgery was discovered, for she had to make up the loss from her own pocket and that was no small matter.
Then the miracle had happened. The doctor had arrived full of apologies, had presented his card and explained. The note was one which he had been keeping as a curiosity. It has been passed on him and was such an excellent specimen that he intended having it framed but it had got mixed up with his other money.
"You started by being the villain of the piece and ended by being my good fairy," she said. "I should never have known there was a vacancy here but for you. I should not have been admitted by the proper Miss Millit but for the terror of your name."
She dropped her little hand lightly on his shoulder. It was a gesture of good-comradeship.
She half-turned to go when an angry exclamation held her.
"What is it? Oh, I see—No. 4!"
She drew a little closer to the doctor's side and watched with narrowing lids the approaching figure.
"Why does he do it—oh, why does he do it?" she demanded impatiently. "How can a man be so weak, so wretchedly weak? There's nothing justifies that!"
"That" was apparently trying to walk the opposite kerb as though it were a tight-rope. Save for a certain disorder of attire, a protruding necktie and a muddy hat, he was respectable enough. He was young and, under other conditions, passably good looking. But with his fair hair streaming over his forehead and his hat at the back of his head he lacked fascination. His attempt, aided by a walking-stick used as a balancing-pole, to keep his equilibrium on six inches of kerbing, might have been funny to a less sensitive soul than Oliva's.
He slipped, recovered himself with a little whoop, slipped again, and finally gave up the attempt, crossing the road to his home.
He recognized the doctor with a flourish of his hat.
"Glorious weather, my Escu-escu-lapius," he said, with a little slur in his voice but a merry smile in his eye; "simply wonderful weather for bacteria