"I owe you, cousin. You've done something amazing here." Then... he frowns. "Dagmar and Dirk know about the original book. Dirk probably will forget, or not care. But Dagmar is no dummy. I won't lie to her if she asks." A sigh. "I can tell her I can't tell her, and she'd trust me. But your secret. Maybe you'd better take the book after all."