"He has left the candle alight, at all events," said Rivers. "Follow me, and look out."
We entered the room close upon each other's heels.
Leaning back in an armchair by the table was Mr. Nisbet. His eyes were closed, and we were face to face with the murderer. His features were perfectly calm and composed.
"How can he sleep so peacefully at such a moment as this?" whispered Bob.
"Yes," said Rivers, stepping forward, "he sleeps peacefully."
Dr. Cooper also stepped forward, and put his ear to Mr. Nisbet's mouth, and his hand to his heart.
"Dead?" asked Rivers.
"Dead," replied Dr. Cooper.
Rivers lifted from the carpet an empty vial which had fallen from the dead man's hand, and held it up to the doctor with a questioning look. Dr. Cooper nodded.