not be denied in spite of many improbabilities, and many strange things with which the book was full; in spite, also, of the varying, uncertain handwriting and style of the message. This one thought was, "This woman is not insane."

While the young official was pondering over the problem, Muller entered as quietly as ever, bowed, put his hat and cane in their places, and shook the snow off his clothing. He was evidently pleased about something. Kurt von Mayringen did not notice his entrance. He was again at the desk with the open book before him, staring at the mysterious words, "How I was murdered."

"It is a woman, a lady of position. And if she is mad, then her madness certainly has method." Muller said these words in his usual quiet way, almost indifferently. The young commissioner started up and snatched for the fine white handkerchief which the detective handed him. A strong sweet perfume filled the room. "It is hers?" he murmured.

"It is hers," said Muller. "At least we can take that much for granted, for the handkerchief bears the same monogram, A. L., which is on the notebook."

Commissioner von Mayringen rose from his chair in evident excitement. "Well?" he asked.

It was a short question, but full of meaning, and one could see that he was waiting in great excitement for the answer. Muller reported what he had discovered. The commissioner thought it little enough, and shrugged his shoulders impatiently when the other had finished.

Muller noticed his chief's dissatisfaction and smiled at it. He himself was quite content with what he had found.

"Is that all?" murmured the commissioner, as if disappointed.

"That is all," repeated the detective calmly, and added, "That is a good deal. We have here a closely written notebook, the contents of which, judging by your excitement, are evidently important. We have also a handkerchief with an unusual perfume on it. I repeat that this is quite considerable. Besides this, we have the seals, and we know several other things. I believe that we can save this lady, or if it be too late, we can avenge her at least."

The commissioner looked at Muller in surprise. "We are in a city of more than a million inhabitants," he said, almost timidly.

"I have hunted criminals in two hemispheres, and I have found them," said Muller simply. The young commissioner smiled and held out his hand. "Ah, yes, Muller—I keep forgetting the great things you have done. You are so quiet about it."

"What I have done is only what any one could do who has that particular faculty. I do only what is in human power to do, and the cleverest criminal can do no more. Besides which, we all know that every criminal commits some stupidity, and leaves some trace behind him. If it is really a crime which we have found the trace of here, we will soon discover it." Muller's editorial "we" was a matter of formality. He might with more truth have used the singular pronoun.

"Very well, then, do what you can," said the commissioner with a friendly smile.

The older man nodded, took the book and its wrappings from the desk, and went into a small adjoining room.

The commissioner sent for an attendant and gave him the order to fetch a pot of tea from a neighbouring saloon. When the tray arrived, he placed several good cigars upon it, and sent it in to Muller. Taking a cigar himself, the commissioner leaned back in his sofa corner to think over this first interesting case of his short professional experience. That it concerned a lady in distress made it all the more romantic.

In his little room the detective, put in good humour by the thoughtful attention of his chief, sat down to read the book carefully. While he studied its contents his mind went back over his search in the silent street outside.

He and Amster had hurried out into the raw chill of the night, reaching the spot of the first discovery in about ten or fifteen minutes. Muller found nothing new there. But he was able to discover in which direction the carriage had been going. The hoof marks of the single horse which had drawn it were still plainly to be seen in the snow.

"Will you follow these tracks in the direction from which they have come?" he asked of Amster. "Then meet me at the station and report what you have seen."

"Very well, sir," answered the workman. The two men parted with a hand shake.

Before Muller started on to follow up the tracks in the other direction, he took up one of the larger pieces' of glass. "Cheap glass," he said, looking at it carefully. "It was only a hired cab, therefore, and a one-horse cab at that."

He walked on slowly, following the marks of the wheels. His eyes searched the road from side to side, looking for any other signs that might have been left by the hand which had thrown the package out of the window. The snow, which had been falling softly thus far, began to come down in heavier flakes, and Muller quickened his pace. The tracks would soon be covered, but they could still be plainly seen. They led out into the open country, but when the first little hill had been climbed a drift heaped itself up, cutting off the trail completely.

Muller stood on the top of this knoll at a spot where the street divided. Towards the right it led down into a factory suburb; towards the left the road led on to a residence colony, and straight ahead the way was open, between fields, pastures and farms, over moors, to another town of considerable size lying beside a river. Muller knew all this, but his knowledge of the locality was of little avail, for all traces of the carriage wheels were lost.

He followed each one of the streets for a little distance, but to no purpose. The wind blew the snow up in such heaps that it was quite impossible to follow any trail under such conditions.

With an expression of impatience Muller gave up his search and turned to go back again. He was hoping that Amster might have had better luck. It was not possible to find the goal towards which the wagon had taken its prisoner—if prisoner she was—as soon as they had hoped. Perhaps the search must be made in the direction from which she had been brought.

Muller turned back towards the city again. He walked more quickly now, but his eyes took in everything to the right and to the left of his path. Near the place where the street divided a bush waved its bare twigs in the wind. The snow which had settled upon it early in the day had been blown away by the freshening wind, and just as Muller neared the bush he saw something white fluttering from one twig. It was a handkerchief, which had probably hung heavy and lifeless when he had passed that way before. Now when the wind held it out straight, he saw it at once. He loosened it carefully from the thorny twigs. A delicate and rather unusual perfume wafted up to his face. There was more of the odour on the little cloth than is commonly used by people of good taste. And yet this handkerchief was far too fine and delicate in texture to belong to the sort of people who habitually passed along this street. It must have something to do with the mysterious carriage. It was still quite dry, and in spite of the fact that the wind had been playing with it, it had been but slightly torn. It could therefore have been in that position for a short time only. At the nearest lantern Muller saw that the monogram on the handkerchief was the same in style and initials as that on the notebook. It was the letters A. L.

CHAPTER TWO. THE STORY OF THE NOTEBOOK

It was warm and comfortable in the little room where Muller sat. He closed the windows, lit the gas, took off his overcoat—Muller was a pedantically careful person—smoothed his hair and sat down comfortably at the table. Just as he took up the little book, the attendant brought the tea, which he proceeded at once to enjoy. He did not take up his little book again until he had lit himself a cigar. He looked