"To explore the passage, of course."
Antony shook his head.
"Why ever not?"
"Well, what do you expect to find there?"
"I don't know. But you seemed to think that we might find something that would help."
"Suppose we find Mark?" said Antony quietly.
"I say, do you really think he's there?"
"Suppose he is?"
"Well, then, there we are."
Antony walked over to the fireplace, knocked out the ashes of his pipe, and turned back to Bill. He looked at him gravely without speaking.