Laura must play her very first play, "The four daughters of doctor March" where she plays the role of Beth. At the same time, Maxime Darcy, an important producer, is arguing with Madame de Saint-Fiacre about the rights to "The Scarlet Princess", a play in which she played and which its author bequeathed to her. On the night of the performance, Laura receives a bouquet of blue roses from a mysterious stranger.