“If you do not apologize to Lady Honoria,” Marcus said, his voice so mild as to be terrifying, “I will kill you.”There was a collective gasp, and Daisy faked a swoon, sliding elegantly into Iris, who promptly stepped aside and let her hit the floor.“Oh, come now,” Mr. Grimston said. “Surely it won’t come to pistols at dawn.”“I’m not talking about a duel,” Marcus said. “I mean I will kill you right here.”