|“||Why travel if you're going to worry about the same things as home? You're free. You just don't know it yet.||”|
–Sophie de Brtetheuil reassuring Rebecca Norton
Sophie is a young, attractive Frenchwoman. Living a priviliged and indlent bohemian life, she is described as provocative and spoiled. Hier practical and social intelligence keeps her interested more in social intrigue rather than politics.
She accompanies her friend Rebecca Norton onboard the Orient Express on Rebecca's first adventure, but she keeps an eye out for other excitements. It is implied that she and Rebecca are engaged in a sexual relationship.
In the 1920s Sophie (under a pseudonym) will achieve success by writing a best-selling gossip book.