"Ah! you are interested? I thought the circumstance illuminating,
also!"

"Did the officer see this person?"

"No; he only heard him. It was some one who endeavored to enter by the
bathroom window, which, I am told, may be reached fairly easily by an
agile climber."

"The attempt did not succeed?"

"No; the constable interrupted, but failed to make a capture or even
to secure a glimpse of the man."

We were both silent for some moments; then:

"What do you propose to do?" I asked.

"We must not let Fu-Manchu's servants know," replied Smith, "but
to-night I shall conceal myself in Slattin's house and remain there
for a week or a day--it matters not how long--until that attempt is
repeated. Quite obviously, Petrie, we have overlooked something which
implicates the murderer with the murder! In short, either by accident,
by reason of our superior vigilance, or by the clumsiness of his plans,
Fu-Manchu for once in an otherwise blameless career, has left a clue!"



CHAPTER X