Chapter 18, The Mysterious Device, Chapter 19, The Scarlet Pimpernel, Chapter 20, The Friend, Chapter 21, Suspense, and Chapter 22, Calais Summary

Marguerite discovers that the door to her husband's study, a room that is always locked, is standing open. Marguerite goes inside, curious about her husband's private rooms. Inside Marguerite finds that instead of the private retreat of a slow-witted man, the study is clearly that of a man with a good head for business with the bills organized and the desk well used. On the floor, Marguerite accidentally kicks a small heavy object. Marguerite picks up this object and discovers a signet ring with the image of a scarlet pimpernel on it.

Marguerite goes downstairs with the ring in her hand, in a daze of sorts. Suzanne, who has come to spend the...