The old servant was summoned; she entered, angular, severe and sharp of eye.
"Miss Corbin tells me," said the secret agent, "that it was you who discovered the body of Dr. Morse."
"It was."
"Would you mind telling me how you came to do so?"
"When he worked at night, he always drank coffee to keep himself awake. I always made and took it to him. When I went into the library to-night, I found him sitting in his chair—dead."
"You heard no shot?"
"No."
"When did you last see the doctor alive?"
"About half past nine. I had just finished locking all the windows and doors when he rang for me."
"Is it your custom to lock up every night?"