A reminiscence of her act ten years ago, recalling how she had secretly married Jean Roussel, flashes through the mind of Mathilda, daughter of Professor Stangerson, when her father asks her to become the wife of Robert Darzac, and how their wedding certificate could not be filed as her husband was imprisoned for passing counterfeit money. But she soon dismisses the horror upon the thought that Roussel must have been dead (she never having heard from or of him) and at last consents to the announcement of her betrothal to Darzac. Roussel, however, was still alive and soon learns of the engagement of Mathilda. By a subterfuge he manages to get a note to her telling her that he still loves her and begging her to flee with him to America. Mathilda was too frightened to answer, so Roussel in a jealous rage goes to the residence of Mathilda and hides in the yellow room occupied by her.