"I'm sure of it."
"He might have come back."
"No; the front door makes a loud noise when it is shut I should have heard him if he had come in that way. And if he had come the other way this man would have seen him."
"You didn't see him at all, did you?"
"No."
"So you can't say whether Jones was the man?"
"No; but I'm sure he wasn't the murderer."
"You think it was suicide?"
"I'm sure of it. How could it have been anything else? The woman was alone."
"There might have been somebody else in the room."