I've wondered why he hasn't done more for himself, with his gifts."

"He never will," replied the Chief. "He may win more fame--he may still go on winning triumphs, but he will go on in a circle; he'll never forge ahead as his capabilities deserve. Muller's peculiarity is that his genius--for the man has undeniable genius--will always make concessions to his heart just at the moment when he is about to do something great--and his triumph is lost."

Horn looked up at his superior, whom, in spite of his good nature, he knew to be a sharp, keen, capable police official. "I forgot you have known Muller longer than the rest of us," he said. "What was that you said about his heart?"

"I said that it is one of those inconvenient hearts that will always make itself noticeable at the wrong time. Muller's heart has played several tricks on the police department, which has, at other times, profited so well by his genius. He is a strange mixture. While he is on the trail of the criminal he is like the bloodhound. He does not seem to know fatigue nor hunger; his whole being is absorbed by the excitement of the chase. He has done many a brilliant service to the cause of justice, he has discovered the guilt, or the innocence, of many in cases where the official department was as blind as Justice is proverbially supposed to be. Joseph Muller has become the idol of all who are engaged in this weary business of hunting down wrong and punishing crime. He is without a peer in his profession. But he has also become the idol of some of the criminals. For if he discovers (as sometimes happens) that the criminal is a good sort after all, he is just as likely to warn his prey, once he has all proofs of the guilt and a conviction is certain.

Possibly this is his way of taking the sting from his irresistible impulse to ferret out hidden mysteries. But it is rather inconvenient, and he has hurt himself by it--hurt himself badly. They were tired of his peculiarities at the capital, and wanted to make his years an excuse to discharge him. I happened to get wind of it, and it was my weakness for him that saved him."

"Yes, you brought him here when they transferred you to this town, I remember now."

"I'm afraid it wasn't such a good thing for him, after all. Nothing ever happens here, and a gift like Muller's needs occupation to keep it fresh. I'm afraid his talents will dull and wither here. The man has grown perceptibly older in this inaction. His mind is like a high-bred horse that needs exercise to keep it in good condition."

"He hasn't grown rich at his work, either," said Horn.

"No, there's not much chance for a police detective to get rich. I've often wondered why Muller never had the energy to set up in business for himself. He might have won fame and fortune as a private detective. But he's gone on plodding along as a police subordinate, and letting the department get all the credit for his most brilliant achievements. It's a sort of incorrigible humbleness of nature--and then, you know, he had the misfortune to be unjustly sentenced to a term in prison in his early youth."

"No, I did not know that."

"The stigma stuck to his name, and finally drove him to take up this work. I don't think Muller realised, when he began, just how greatly he is gifted. I don't know that he really knows now. He seems to do it because he likes it--he's a queer sort of man."

While the commissioners drove through the streets to the police station the man of whom they were speaking sat in Johann's little room in close consultation with the valet.

"How long is it since the Professor began to give you money to go to the theatre on Sat.u.r.day evenings?"

The first time it happened was on my name day. "What's the rest of your name? There are so many Johanns on the calendar."

"I am Johann Nepomuk."

Muller took a little calendar from his pocket and turned its pages. "It was May sixteenth," volunteered the valet.

"Quite right. May sixteenth was a Sat.u.r.day. And since then you have gone to the theatre every Sat.u.r.day evening?"

"Yes, sir.

"When did the owner of the house go away?"

"Last April. His wife was ill and he had to take her away. They went to Italy."

"And you two have been alone in the house since April?"

"Yes, sir, we two."

"Was there no janitor?"

"No, sir. The garden was taken care of by a man who came in for the day."

"And you had no dog? I haven't seen any around the place."

"No, sir; the Professor did not like animals. But he must have been thinking about buying a dog, because I found a new dog-whip in his room one day."

"Somebody might have left it there. One usually buys the dog first and then the whip."

"Yes, sir. But there wasn't anybody here to forget it. The Professor did not receive any visits at that time."

"Why are you so sure of that?"

"Because it was the middle of summer, and everybody was away."

"Oh, then, we won't bother about the whip. Can you tell me of any ladies with whom the Professor was acquainted?"

"Ladies? I don't know of any. Of course, the Professor was invited out a good deal, and most of the other gentlemen from the college were married."

"Did he ever receive letters from ladies?" continued Muller.

Johann thought the matter over, then confessed that he knew very little about writing and couldn't read handwriting very well anyway. But he remembered to have seen a letter now and then, a little letter with a fine and delicate handwriting.

"Have you any of these envelopes?" asked Muller. But Johann told him that in spite of his usual carelessness in such matters, Professor Fellner never allowed these letters to lie about his room.

Finally the detective came out with the question to which he had been leading up. "Did your master ever receive visits from ladies?"

Johann looked extremely stupid at this moment. His lack of intelligence and a certain crude sensitiveness in his nature made him take umbrage at what appeared to him a very unnecessary question. He answered it with a shake of the head only. Muller smiled at the young man's ill-concealed indignation and paid no attention to it.

"Your master has been here for about a year. Where was he before that?"

"In the capital."

"You were in his service then?"

"I have been with him for three years."

"Did he know any ladies in his former home?"

"There was one--I think he was engaged to her."

"Why didn't he marry her?"

"I don't know."

"What was her name?"

"Marie. That's all I know about it."

"Was she beautiful?"

"I never saw her. The only way I knew about her was when the Professor's friends spoke of her."

"Did he have many friends?"

"There were ever so many gentlemen whom he called his friends."