"May I, then, recommend you to consult your direct superiors before carrying your investigations any furthur, Mr.--" "Furneaux--Charles Francois Furneaux." "Just so, Mr.Charles Francois Furneaux." "I give you my full name, because one of the peculiar features of this case is the inability of some persons mixed up in it to recall names, or even the mere salient facts," and the detective's glance dwelt for an instant on Theydon, who, again, in his own estimation, shrank into the boots of a fourth-form boy detected by a master in an overt breach of college rules.
But the little man was speaking impressively, and, Theydon compelled his wandering wits to pay attention.
"It will clear the air, perhaps," went on Furneaux, "if I point out that if any one here is playing the spy--carrying on some underhanded game, that is--it is not I.These apartments are in charge of the police.

The manager of the whole block of flats and the porter of this particular section have been warned that no one can be allowed to enter No.

17, on any pretext, until our inquiry is closed.

Now, Mr.Forbes, kindly explain how you contrived to get possession of a key." An experienced man of the world like Forbes could hardly fail to see that he was in a false position, and that any persistent attempt to browbeat the detective would not only meet with utter failure but might possibly compromise him gravely.
"That was a simple matter," he said.

"Mrs.Lester's servant left her key in Mr.Theydon's establishment.