DANIEL W ATERHOUSE REMOVED a handkerchief from his breast pocket, draped it over his hand, and used it to grip the handle of the assassin’s dagger. The weapon had been borne into the room—a servants’ pantry near Princess Caroline’s apartment—on a silver tray, like an hors d’ouevre. Daniel held it several inches above a candle, so that the blade split the current of warm air rising from the flame. Then he leaned forward and got his beak into a position some distance above that. He gave the air the tiniest sniff, then recoiled and turned away from it. The dagger he set back on the tray, and the handkerchief he wadded up and threw into a cold fireplace in the corner of the pantry.