"Wha-a-at is it?" she muttered, then opened her eyes wide. In the darkness of the Pullman berth she could see nothing at all save a faint perpendicular line of light at the edges of the curtains that enclosed the section. "I-I wonder what made me wake up so suddenly?" Barbara put out a groping hand. The hand came in contact with Mollie Thurston's face. Mollie brushed it away, muttering irritably in her sleep. Then all at once Barbara discovered what had awakened her. Close at hand she heard the voices of two men. They were conversing in low, cautious tones.