"I am aware of that," said Margaret, forcing herself to speak in an indifferent, careless way. "I am aware of what I must appear to you, but the secret is another person's, and I cannot explain it without doing him harm."

'I am aware of that,' said Margaret, forcing herself to speak in an indifferent way. 'I am aware of what I must appear to you, but the secret is another person's, and I cannot explain it without doing him harm.'
