The smile on his face slipped. He grew very serious. She could tell just by looking at the openness of his face that he wasn't about to tell her a lie. One of the skills she acquired working for as long as she did as an interrogator was to be able to tell easily when someone was about to be dishonest. He had none of the markers of a forthcoming lie. Of course, he could also just be that skilled in lying. She couldn't afford to take anything that he said at face value.