Rose and Topaz go to London with Mrs Cotton to purchase Rose's wedding trousseau. While everyone else is away Cassandra and Simon spend the evening together, which leads to their kissing. Cassandra becomes obsessed with Simon, but suffers feelings of guilt since he is Rose's fiancé. Cassandra concludes that she must tactfully deflect Stephen's offer of love, and encourage him in his emerging career as a model and a film actor. She joins forces with Thomas to help their father overcome his writer's block by the drastic expedient of imprisoning him in a medieval tower; copes with her own increasing attraction to Simon; and records everything in her journal.