“So it would seem,” said Holmes. “Perhaps you can account also for the bullet which has so obviously struck the edge of the window?”
He had turned suddenly, and his long, thin finger was pointing to a hole which had been drilled right through the lower window-sash, about an inch above the bottom.
“By George!” cried the inspector. “How ever did you see that?”
“Because I looked for it.”
“Wonderful!” said the country doctor. “You are certainly right, sir. Then a third shot has been fired, and therefore a third person must have been present. But who could that have been, and how could he have got away?”
“That is the problem which we are now about to solve,” said Sherlock Holmes. “You remember, Inspector Martin, when the servants said that on leaving their room they were at once conscious of a smell of powder, I remarked that the point was an extremely important one?”
“Yes, sir; but I confess I did not quite follow you.”
“It suggested that at the time of the firing, the window as well as the door of the room had been open. Otherwise the fumes of powder could not have been blown so rapidly through the house. A draught in the room was necessary for that. Both door and window were only open for a very short time, however.”
“How do you prove that?”
“Because the candle was not guttered.”
“Capital!” cried the inspector. “Capital!”
“Feeling sure that the window had been open at the time of the tragedy, I conceived that there might have been a third person in the affair, who stood outside this opening and fired
