“No,” said Lala, “we have never had robbers in the house.” She looked up at Durham naively. “You are not a thief, are you?” she asked.  
“No, I assure you I am not,” he answered, and felt himself flushing to the roots of his hair.
 
They were seated in a teashop patronized by the workers of the district; and as Durham, his elbows resting on the marble-topped table, looked into the dark eyes of his companion, he told himself again that whatever might be the secrets of old Huang Chow, his daughter did not share them.
 
The Chinaman had made no report to the authorities, although the piled up furniture beneath the skylight must have afforded conclusive evidence that a burglarious entry had been made into the premises.
 
“I should feel very nervous,” Durham declared, “with all those valuables in the house.”
 
“I feel nervous about my father,” the girl answered in a low voice. “His room opens out of the warehouse, but mine is shut away in another part of the building. And Ah Fu sleeps behind the office.”
 
“Were you not afraid when you suspected that Cohen was a burglar? You told me yourself that you did suspect him.”
 
“Yes, I spoke to my father about it.”
 
“And what did he say?”
 
“Oh”—she shrugged her shoulders—“he just smiled and told me not to worry.”
 
“And that was the last you heard about the matter?”
 
“Yes, until you told me he was dead.”
 
Again he questioned the dark eyes and again was baffled. He felt tempted, and not for the first time, to throw up the case. After all, it rested upon very slender data—the mysterious death of a Chinaman whose history was unknown and the story of a crook whose word was worth nothing.
 
Finally he asked himself, as he had asked himself before, what did it matter? If old Huang Chow had disposed of these people in some strange manner, they had sought to rob him. The morality of the case was complicated and obscure, and more and more he was falling under the spell of Lala's dark eyes.
 
But always it was his professional pride which came to the rescue. Murder had been done, whether justifiably or otherwise, and to him had been entrusted the discovery of the murderer. It seemed that failure was to be his lot, for if Lala knew anything she was a most consummate actress, and if she did not, his last hope of information was gone.
 
He would have liked nothing better than to be rid of the affair, provided he could throw up the case with a clear conscience. But when presently he parted from the attractive Eurasian, and watched her slim figure as, turning, she waved her hand and disappeared round a corner, he knew that rest was not for him.
 
He had discovered the emporium of a Shadwell live-stock dealer with whom Ah Fu had a standing order for newly fledged birds of all descriptions. Purchases apparently were always made after dusk, and Ah Fu with his birdcage was due that evening.
 
A scheme having suggested itself to Durham, he now proceeded to put it into execution, so that when dusk came, and Ah Fu, carrying an empty birdcage, set out from the house of Huang Chow, a very dirty-looking loafer passed the corner of the street at about the time that the Chinaman came slinking out.
 
Durham had mentally calculated that Ah Fu would be gone about half an hour upon his mysterious errand, but the Chinaman travelled faster than he had calculated.
 
Just as he was about to climb up once more on to the sloping roof, he heard the pattering footsteps returning to the courtyard, although ra............