“At first the maid thought that young Smith was already dead, but on pouring some water from the carafe over his forehead he opened his eyes for an instant. ‘The professor,’ he murmured — ‘it was she.’ The maid is prepared to swear that those were the exact words. He tried desperately to say something else, and he held his right hand up in the air. Then he fell back dead.

“In the meantime the housekeeper had also arrived upon the scene, but she was just too late to catch the young man’s dying words. Leaving Susan with the body, she hurried to the professor’s room. He was sitting up in bed horribly agitated, for he had heard enough to convince him that something terrible had occurred. Mrs. Marker is prepared to swear that the professor was still in his night-clothes, and indeed it was impossible for him to dress without the help of Mortimer, whose orders were to come at twelve o’clock. The professor declares that he heard the distant cry, but that he knows nothing more. He can give no explanation of the young man’s last words, ‘The professor — it was she,’ but imagines that they were the outcome of delirium. He believes that Willoughby Smith had not an enemy in the world, and can give no reason for the crime. His first action was to send Mortimer, Mortimer the gardener, for the local police. A little later the chief constable sent for me. Nothing was moved before I got there, and strict orders were given that no one should walk upon the paths leading to the house. It was a splendid chance of putting your theories into practice, Mr. Sherlock Holmes. There was really nothing wanting.”

“Except Mr. Sherlock Holmes,” said my companion, with a somewhat bitter smile. “Well, let us hear about it. What sort of job did you make of it?”

“I must ask you first, Mr. Holmes, to glance at this rough plan, which will give you a general idea of the position of the professor’s study and the various points of the case. It will help you in following my investigation.”

He unfolded the rough chart, which I here reproduce, and he laid it across Holmes’s knee. I rose and, standing behind Holmes, studied it over his shoulder.

“It is very rough, of course, and it only deals with the points which seem to me to be essential. All the rest you will see later for yourself. Now, first of all, presuming that the assassin entered the house, how did he or she come in? Undoubtedly by the garden path and the back door, from which there is direct access to the study. Any other way would have been exceedingly complicated. The escape must have also been made along that line, for of the two other exits from the room one was blocked by Susan as she ran downstairs and the other leads straight to the professor’s bedroom. I therefore directed my attention at once to the garden path, which was saturated with recent rain, and would certainly show any footmarks.

“My examination showed me that I was dealing with a cautious and expert criminal. No footmarks were to be found on the path. There could be no question, however, that someone had passed along the grass border which lines the path, and that he had done so in order to avoid leaving a track. I could not find anything in the nature of a distinct impression, but the grass was trodden down, and someone had undoubtedly passed. It could only have been the murderer, since neither the gardener nor anyone else had been there that morning, and the rain had only begun during the night.”

He knew too well what was about to happen in the house of the poor doctor to feel any desire to look into it. He did not even get up when his only servant -- who envied the lot of the servants of Cornelius just as bitterly as Boxtel did that of their master -- entered his bedroom. He said to the man, --

"I shall not get up to-day, I am ill."

About nine o'clock he heard a great noise in the street which made him tremble, at this moment he was paler than a real invalid, and shook more violently than a man in the height of fever.

His servant entered the room; Boxtel hid himself under the counterpane.

"Oh, sir!" cried the servant, not without some inkling that, whilst deploring the mishap which had befallen Van Baerle, he was announcing agreeable news to his master, -- "oh, sir! you do not know, then, what is happening at this moment?"

"How can I know it?" answered Boxtel, with an almost unintelligible voice.

"Well, Mynheer Boxtel, at this moment your neighbour Cornelius van Baerle is arrested for high treason."

"Nonsense!" Boxtel muttered, with a faltering voice; "the thing is impossible."

"Faith, sir, at any rate that's what people say; and, besides, I have seen Judge van Spennen with the archers entering the house."

"Well, if you have seen it with your own eyes, that's a different case altogether."

"At all events," said the servant, "I shall go and inquire once more. Be you quiet, sir, I shall let you know all about it."

Boxtel contented himself with signifying his approval of the zeal of his servant by dumb show.

The man went out, and returned in half an hour.

"Oh, sir, all that I told you is indeed quite true."

"How so?"

"Mynheer van Baerle is arrested, and has been put into a carriage, and they are driving him to the Hague."

"To the Hague!"

"Yes, to the Hague, and if what people say is true, it won't do him much good."

"And what do they say?" Boxtel asked.

"Faith, sir, they say -- but it is not quite sure -- that by this hour the burghers must be murdering Mynheer Cornelius and Mynheer John de Witt."

"Oh," muttered, or rather growled Boxtel, closing his eyes from the dreadful picture which presented itself to his imagination.

"Why, to be sure," said the servant to himself, whilst leaving the room, "Mynheer Isaac Boxtel must be very sick not to have jumped from his bed on hearing such good news."

And, in reality, Isaac Boxtel was very sick, like a man who has murdered another.

But he had murdered his man with a double object; the first was attained, the second was still to be attained.

Night closed in. It was the night which Boxtel had looked forward to.

As soon as it was dark he got up.

He then climbed into his sycamore.

He had calculated correctly; no one thought of keeping watch over the garden; the house and the servants were all in the utmost confusion.

He heard the clock strike -- ten, eleven, twelve.

At midnight, with a beating heart, trembling hands, and a livid countenance, he descended from the tree, took a ladder, leaned it against the wall, mounted it to the last step but one, and listened.