As soon as the corpse had been taken away, the police commissioner returned to the station. But Muller remained there all alone to make a thorough examination of the entire vicinity.
It was not a very attractive spot, this particular part of the street. There must have been a nursery there at one time, for there were still several ordered rows of small trees to be seen.
There were traces of flower cultivation as well, for several trailing vines and overgrown bushes showed where shrubs had been grown which do not usually grow without man's assistance.
Immediately back of the old elder tree Muller found several fine examples of rare flowers, or rather he found the shrubs which his experienced eye recognised as having once borne these unusual blossoms. One or two blooms still hung to the bushes and the detective, who was a great lover of flowers, picked them and put them in his buttonhole. While he did this, his keen eyes were darting about the place taking in all the details. This vacant lot had evidently been used as an unlicensed dumping ground for some time, for all sorts of odds and ends, old boots, bits of stuff, silk and rags, broken bottles and empty tin cans, lay about between the bushes or half buried in the earth. What had once been an orderly garden was now an untidy receptacle for waste.
The pedantically neat detective looked about him in disgust, then suddenly he forgot his displeasure and a gleam shot up in his eye.
It was very little, the thing this man had seen, this man who saw so much more than others.
About ten paces from where he stood a high wooden fence hemmed in the lot. The fence belonged to the neighbouring property, as the lot in which he stood was not protected in any way. To the back it was closed off by a corn field where the tall stalks rustled gently in the faint morning breeze. All this could be seen by anybody and Muller had seen it all at his first glance. But now he had seen something else. Something that excited him because it might possibly have some connection with the newly discovered crime. His keen eyes, in glancing along the wooden fence at his right hand, had caught sight of a little twig which had worked its way through the fence. This twig belonged to a willow tree which grew on the other side, and which spread its grey-green foliage over the fence or through its wide openings. One of the little twigs which had crept in between the planks was broken, and it had been broken very recently, for the leaves were still fresh and the sap was oozing from the crushed stem. Muller walked over to the fence and examined the twig carefully. He soon saw how it came to be broken. The broken part was about the height of a man's knee from the ground. And just at this height there was quite a space between two of the planks of the fence, heavy planks which were laid cross-ways and nailed to thick posts. It would have been very easy for anybody to get a foothold in this open space between the planks.
It was very evidently some foot thrust in between the planks which had broken the little willow twig, and its soft rind had left a green mark on the lower plank. "I wonder if that has anything to do with the murder," thought Muller, looking over the fence into the lot on the other side.
This neighbouring plot was evidently a neglected garden. It had once worn an aristocratic air, with stone statues and artistic arrangement of flower beds and shrubs. It was still attractive even in its neglected condition. Beyond it, through the foliage of its heavy trees, glass windows caught the sunlight. Muller remembered that there was a handsome old house in this direction, a house with a mansard roof and wide-reaching wings. He did not now know to whom this handsome old house belonged, a house that must have been built in the time of Maria Theresa, ... but he was sure of one thing, and that was that he would soon find out to whom it belonged. At present it was the garden which interested him, and he was anxious to see where it ended. A few moments' further inspection showed him what he wanted to know. The garden extended to the beginning of the park-like grounds which surrounded the old house with the mansard roof. A tall iron railing separated the garden from the park, but this railing did not extend down as far as the quiet lane. Where it ended there was a light, well-built wooden fence. Along the street side of the fence there was a high thick hedge. Muller walked along this hedge until he came to a little gate. Then crossing the street, he saw that the house whose windows glistened in the sunlight was a house which he knew well from its other side, its front facade.
Now he went back to the elder tree and then walked slowly away from this to the spot where he found the broken willow twig. He examined every foot of the ground, but there was nothing to be seen that was of any interest to him-not a footprint, or anything to prove that some one else had passed that way a short time before. And yet it would have been impossible to pass that way without leaving some trace, for the ground was cut up in all directions by mole hills.
Next the detective scrutinised as much of the surroundings as would come into immediate connection with the spot where the corpse had been found. There was nothing to be seen there either, and Muller was obliged to acknowledge that he had discovered nothing that would lead to an understanding of the crime, unless, indeed, the broken willow twig should prove to be a clue. He sprang back across the ditch, turned up the edges of his trousers where they had been moistened by the dew and walked slowly along the dusty street. He was no longer alone in the lane. An old man, accompanied by a large dog, came out from one of the new houses and walked towards the detective, he was very evidently going in the direction of the elder-tree, which had already been such a centre of interest that morning. When he met Muller, the old man halted, touched his cap and asked in a confidential tone: "I suppose you've been to see the place already?""Which place?" was Muller's reserved answer.
