LATER was forthcoming evidence to show that poor Weymouth had lived a wild life, in hiding among the thick bushes of the tract of land which lay between the village and the suburb on the neighboring hill. Literally, he had returned to primitive savagery and some of his food had been that of the lower animals, though he had not scrupled to steal, as we learned when his lair was discovered.  
He had hidden himself cunningly; but witnesses appeared who had seen him, in the dusk, and fled from him. They never learned that the object of their fear was Inspector John Weymouth. How, having escaped death in the Thames, he had crossed London unobserved, we never knew; but his trick of knocking upon his own door at half-past two each morning (a sort of dawning of sanity mysteriously linked with old custom) will be a familiar class of symptom to all students of alienation.
 
I revert to the night when Smith solved the mystery of the knocking.
 
In a car which he had in waiting at the end of the village we sped through the deserted streets to New Inn Court. I, who had followed Nayland Smith through the failures and successes of his mission, knew that to-night he had surpassed himself; had justified the confidence placed in him by the highest authorities.
 
We were admitted to an untidy room—that of a student, a traveler and a crank—by a plain-clothes officer. Amid picturesque and disordered fragments of a hundred ages, in a great carven chair placed before a towering statue of the Buddha, sat a hand-cuffed man. His white hair and beard were patriarchal; his pose had great dignity. But his expression was entirely masked by the smoked glasses which he wore.
 
Two other detectives were guarding the prisoner.
 
"We arrested Professor Jenner Monde as he came in, sir," reported the man who had opened the door. "He has made no statement. I hope there isn't a mistake."
 
"I hope not," rapped Smith.
 
He strode across the room. He was consumed by a fever of excitement. Almost savagely, he tore away the beard, tore off the snowy wig dashed the smoked glasses upon the floor.
 
A great, high brow was revealed, and green, malignant eyes, which fixed themselves upon him with an expression I never can forget.
 
IT WAS DR. FU-MANCHU!
 
One intense moment of silence ensued—of silence which seemed to throb. Then:
 
"What have you done with Professor Monde?" demanded Smith.
 
Dr. Fu-Manchu showed his even, yellow teeth in the singularly evil smile which I knew so well. A manacled prisoner he sat as unruffled as a judge upon the bench. In truth and in justice I am compelled to say that Fu-Manchu was absolutely fearless.
 
"He has been detained in China," he replied, in smooth, sibilant tones—"by affairs of great urgency. His well-known personality and ungregarious habits have served me well, here!"
 
Smith, I could see, was undetermined how to act; he stood tugging at his ear and glancing from the impassive Chinaman to the wondering detectives.
 
"What are we to do, sir?" one of them asked.
 
"Leave Dr. Petrie and myself alone with the prisoner, until I call you."
 
The three withdrew. I divined now what was coming.
 
"Can you restore Weymouth's sanity?" rapped Smith abruptly. "I cannot save you from the hangman, nor"—his fists clenched convulsively—"would I if I could; but—"
 
Fu-Manchu fixed his brilliant eyes upon him.
 
"Say no more, Mr. Smith," he interrupted; "you misunderstand me. I do not quarrel with that, but what I have done from conviction and what I have done of necessity are separated—are seas apart. The brave Inspector Weymouth I wounded with a poisoned needle, in self-defense; but I regret his condition as greatly as you do. I respect such a man. There is an antidote to the poison of the needle."
 
"Name it," said Smith.
 
Fu-Manchu smiled again.
 
"Useless," he replied. "I alone can prepare it. My secrets shall die with me. I will make a sane man of Inspector Weymouth, but no one else shall be in the house but he and I."
 
"It will be surrounded by police," interrupted Smith grimly.
 
"As you please," said Fu-Manchu. "Make your arrangements. In that ebony case upon the table are the instruments for the cure. Arrange for me to visit him where and when you will—"
 
"I distrust you utterly. It is some trick," jerked Smith.
 
Dr. Fu-Manchu rose slowly and drew himself up to his great height. His manacled hands could not rob him of the uncanny dignity which was his. He raised them above his head with a tragic gesture and fixed his piercing gaze upon Nayland Smith.
 
"The God of Cathay hear me," he said, with a deep, guttural note in his voice—"I swear—"
 
The most awful visitor who ever threatened the peace of England, the end of the visit of Fu-Manchu was characteristic—terrible—inexplicable.
 
Strange to relate, I did not doubt that this weird being had conceived some kind of admiration or respect for the man to whom he had wrought so terrible an injury. He was capable of such sentiments, for he entertained some similar one in regard to myself.
 
A cottage farther down the village street than Weymouth's was vacant, and in the early dawn of that morning became the scene of outre happenings. Poor Weymouth, still in a comatose condition, we removed there (Smith having secured the key from the astonished agent). I suppose so strange a specialist never visited a patient before—certainly not under such conditions.
 
For into the cottage, which had been entirely surrounded by a ring of police, Dr. Fu-Manchu was admitted from the closed car in which, his work of healing complete, he was to be borne to prison—to death!
 
Law and justice were suspended by my royally empowered friend that the enemy ............