"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."