"I know a great many things, Mr. Inspector. For instance, I know that the woman who assisted Dr. Etwald to steal the body is Dido, the negress of Mrs. Dallas; also that Dr. Etwald is a murderer as well as a thief." "Heavens! If I had only known that I would have had the warrant altered." "What!" cried Jen, with an expression of ferocious joy lighting up his face, "you have a warrant for the arrest of Etwald?" "Yes, but on the charge of stealing the body only. I took it out after hearing the evidence of the tramp, Battersea." "Very good. Then you can take out a warrant for his arrest as a murderer, after hearing my evidence." "Can you prove him guilty?" Jen rose to his feet and stretched out one hand toward Arkel. "I swear, on my sacred honor, that Maurice Alymer was killed by Max Etwald!" At this moment the door of the library opened slowly, and Dr. Etwald, calm and composed, appeared on the threshold. Behind him, over his shoulder, peered the pale countenance of David. From the ironical look on the doctor's face it would appear that he had overheard the accusation of the major, and was prepared to treat it with contempt. That such was the case appeared by the first words which issued from his mouth as he faced his accuser. "I hear the name of Max Etwald coupled with the crime of murder. Is this the way you treat your guests, major?" "You are not my guest," retorted Jen, furiously. "No; rather your victim, seeing that you have lured me into a trap. It was not to see Jaggard that you asked me here; but rather to force me--if you can--into confessing that I am guilty of a triple crime." "You make one slight mistake, sir," said Jen, coldly. "I accuse you of two crimes, not of three." "Ah, you are lenient," replied Etwald, a shade of surprise passing over his features, a surprise which was reflected in the agitated face of David Sarby. "Well, sir, let me hear of what I am accused." With the utmost coolness he entered the room and sat down in a chair near Arkel. The inspector, with his hand in his breast-pocket, fingered the warrant, but did not deem it wise to execute it until he had heard what proof the major possessed against Etwald for the murder of Maurice Alymer. David sat down near the door, and followed every movement of the scene which ensued with keen eyes. Thus, three of the occupants of the room were seated--Sarby, Arkel, and Etwald. Only one man stood up--Major Jen--and he stood as the accuser. "Dr. Etwald," said the major, with great calmness and deliberation, "you are a clever and ambitious man, who wishes to make his way in the world, but has hitherto failed to do so for lack of money. To procure money for your experiments in chemistry, you would do anything--even marry a rich woman!" "Or murder the man formerly engaged to her," retorted Etwald, with a pale smile. "Go on. Major Jen, I see the mark you are aiming at."