"How do you know?"
"I know him."
"You do?"
"Yes."
"You have seen him before?"
"I should say so, on several occasions. He is one of my bitterest enemies. This is not the first time he has tried to kill or injure me. He has made the attempt many times before. He is the only person here who would do such a thing."
"If this is true," said the engineer, grimly, "he shall pay dearly for his work!"
The assistant nodded.
"What have you to say, Hackett?" demanded the engineer.
"I say it's a lie!" growled the fellow. "I never saw this chap before he came into the engine-room. He doesn't know me, and I don't know him."