Holmes led us along the passage with as much certainty as if he had lived in the house, and halted at the open door of the strong-room.
"Pooh! What an awful smell of paint!" cried the Inspector.
"That was our first clue," said Holmes. "You can thank Dr. Watson's observation for that, though he failed to draw the inference. It set my foot upon the trail. Why should this man at such a time be filling his house with strong odours? Obviously, to cover some other smell which he wished to conceal—some guilty smell which would suggest suspicions. Then came the idea of a room such as you see here with iron door and shutter—a hermetically sealed room. Put those two facts together, and whither do they lead? I could only determine that by examining the house myself. I was already certain that the c
