As I came out I met the steward whose business it was to look after me. He whispered that the captain wanted to see me, and then scuttled away down the passage as if very anxious to avoid any questions. I went toward the captain's cabin, and found him waiting for me.

"Sir," said he, "I want to ask a favour of you."

I answered that I would do anything to oblige him.

"Your room-mate has disappeared," he said. "He is known to have turned in early last night. Did you notice anything extraordinary in his manner?"

The question, coming as it did in exact confirmation of the fears the doctor had expressed half an hour earlier, staggered me.

"You don't mean to say he has gone overboard?" I asked.

"I fear he has," answered the captain.

"This is the most extraordinary thing—" I began.

"Why?" he asked.