boy, and a very keen and clever boy, who entered here alone. See upon this table, upon the window sills, and upon the desk, the prints of one, two, and sometimes all four, small slender fingers."
Ferrars paused a moment, while they examined the dust prints, faint but yet clear, upon the dark wood, and making lines of clearer colour upon the painted brown of the window sills.
"And what," asked Brierly, speaking for the first time since the detective began his explanation—"what was his real object?"
"His real object! Ah, I see you have been observant, and if I am not much mistaken he has left something; but the things he took were taken solely to cover up the real reason of his coming. Mr. Charles Brierly's pistol, his watch, and the foreign bijouterie were so little wanted by this remarkable boy that he will no doubt get rid of them in some way at the first opportunity. All but one thing."
"And that?" asked Brierly, breathlessly.
Ferrars walked over to the writing-desk and signed them to follow. "Observe that letter file!" he said. "There is not much upon it, bills for school books, two or three circulars, and so on, but observe that this file hangs over the top of the desk, so that anything falling from it would touch just here. He moistened the tip of
