He stopped and looked at a patch of shadow near the galley. "Some one is hiding there," he whispered. "I saw him sneak into it."

"Nonsense!" I growled. "The moon and something else are affecting your brain."

"But I'm sure of it," he gasped.

He sprang for the spot as he finished speaking, but he found nothing. He returned to my side shaking his head as if only half convinced about the matter.

"Some one was listening to us talking, but whoever it was he managed to slip away while we were arguing the question."

"Well, he didn't learn much," I said. "It was probably one of the islanders, and you've scared the life out of him now."

Holman gripped my arm as I turned away, and he put a question in a tense whisper.

"What do you think of Leith?" he asked.

Somehow the question did not surprise me, but I was not in a hurry to give my opinion of the, Professor's partner.

"I have only spoken a few words to him," I countered cautiously.