"Only Sir Jasper, sir. He was——"
"Just answer my questions," said Malcolm Sage gently. "He told you,
I think, never on any account to disturb him?"
"Yes, sir."
"Did you ever do so?"
"Only once, sir."
"That was?"
"When Mrs. Graham, that's the housekeeper, sir, set fire to the curtains of her room. I was afraid for the house, sir, and I ran down and knocked at the laboratory door."
"Did the professor open it?"
"No, sir."
"Perhaps he did not hear you?"