"They're the train robbers, all right!" insisted Tommy. "I can't see their faces any more than you can, but I remember that voice! You remember the night he was at our camp, and we were getting something to eat? Well, I heard quite a lot of his conversation that night. Some of it I liked and some of it I didn't, but I'm sure the man whose conversation I heard that night is the same man who ordered the cowboy officers to throw down their weapons."