The Cup of Fury
"Which Was The Real Woman Was the laughing, dancing butterfly of wealth and luxury the real she? Or was it the worker of brawn and muscle, who cast aside money and ease for the lot of common laborer?"
Sir Joseph and Lady Webbing are the foster parents of Marie-Louise. The couple are also in league with Verrinder, a German spy. When their work against England is discovered, they commit suicide. Marie-Louise, who has been an unwitting part of their schemes, is allowed to go to the U.S. if she promises to keep everything a secret.