"Monsieur Thuran has been explaining some of the mysteries of
navigation to me," explained the girl.

Tarzan paid little heed to the conversation that ensued--he was
attempting to recall where he had met Monsieur Thuran before. That
it had been under peculiar circumstances he was positive. Presently
the sun reached them, and the girl asked Monsieur Thuran to move her
chair farther back into the shade. Tarzan happened to be watching
the man at the time, and noticed the awkward manner in which he handled
the chair--his left wrist was stiff. That clew was sufficient--a
sudden train of associated ideas did the rest.

Monsieur Thuran had been trying to find an excuse to make a graceful
departure. The lull in the conversation following the moving of
their position gave him an opportunity to make his excuses. Bowing
low to Miss Strong, and inclining his head to Tarzan, he turned to
leave them.

"Just a moment," said Tarzan. "If Miss Strong will pardon me I
will accompany you. I shall return in a moment, Miss Strong."

Monsieur Thuran looked uncomfortable. When the two men had passed
out of the girl's sight, Tarzan stopped, laying a heavy hand on
the other's shoulder.

"What is your game now, Rokoff?" he asked.

"I am leaving France as I promised you," replied the other, in a
surly voice.