What to do next? But Geoffrey was not long in doubt. Ralph was standing by his side, a dark lantern in his hand.
"Where did she go?" he whispered.
"You heard her, then?" asked Geoffrey.
"Of course, I heard everything. I see with my ears. Naturally you guessed who she was. But what room did she go into?"
"My grandfather's."
"So I expected. But she means to visit all the rooms in turn. You need not be afraid, she will be there for some minutes. What do you see outside?"
Geoffrey made a close examination with the lantern.
"I see a tangle of small wires on the floor," he said. "They come up from the vaults."
"Where they are attached to a queer-looking instrument?"
"Yes, yes. I see you know all about it. One of the wires runs under the door into the room where Mrs. May is engaged."