"I'm a girl." When Deryn opened her eyes, the lady boffin was staring at her with no change of expression. "Indeed," she said. Deryn's mouth feel open. "You mean you...Did you barking ?" "I had no idea at all. But I make it a policy never to appear surprised." Dr. Barlow sighed, staring out the window. "Though on this occasion, it is proving rather more demanding than usual. A girl, you say? And you're quite certain?"