However, a group of conspiring antagonists, including Mme. Beck, the priest Père Silas, and the relatives of M. Paul's long-dead fiancée, work to keep the two apart. They finally succeed in forcing M. Paul's departure for the West Indies to oversee a plantation there. He nonetheless declares his love for Lucy before his departure and arranges for her to live independently as the headmistress of her own day school, which she later expands into a pensionnat (boarding school).
During the course of the novel, Lucy has three encounters with the figure of a nun — which may be the ghost of a nun who was buried alive on the school's grounds as punishment for breaking her vow of chastity. In a highly symbolic scene near the end of the novel, she discovers the "nun's" habit in her bed and destroys it. She later finds out that it was a disguise worn by Ginevra's amour, Alfred de Hamal. The episodes with the nun no doubt contributed substantially to the novel's reputation as a gothic novel.