Magdalen and Norah Vanstone have known only comfort and affluence for their entire lives. Orphaned suddenly following the unexpected deaths of their parents, the illegitimate sisters find themselves flung into the other extreme of living: their father had neglected to amend his will following their parents' recent marriage, leaving them with nothing, and their bitter, estranged uncle, the legal inheritor of the family fortune, mercilessly refuses them support.

A masterful blend of Gothic drama and romance, Wilkie Collins' mystery novel is an exploration of illegitimacy and inheritance. Set in Cornwall, the plot foreshadows The Woman in White with its themes of doubtful identity and deception and involves a broad array of characters. The "secret" of the book's title is the true parentage of the book's heroine, Rosamond Treverton, which has been written down and kept in an unused room at Porthgenna Tower. This is where, 20 years later, much of the novel's action is set.

Madame Pratolungo is a close companion to Lucilla Finch, a young woman who has been blind since birth. Madame Pratolungo records the narrative of Lucilla's trials from falling in love with Oscar Duborg, her wealthy and shy neighbor, to ending up in a romantic entanglement between Oscar and his brother Nugent. When Lucilla temporarily regains her sight thanks to Herr Grosse, mistaken identities and manipulative schemes are there to greet her.

When Lord Montbarry dies suddenly in his Venice palace, and his courier goes missing, suspicion is instantly thrown on his new wife, the beautiful Countess Narona, who has collected his life insurance and fled to America. Montbarry's former fiance, Agnes, still harboring feelings for him, and Henry Westwick, Montbarry's younger brother, decide to investigate this tragedy and head for the palace, now a hotel. Not long after their arrival they experience strange and unsettling occurrences, and the circumstances of Montbarry's death begin to unravel.

Appearing in 1852, Basil was Wilkie Collins’s second published novel. The eponymous narrator is emotionally torn between two women: Margaret Sherwin and his sister Clara. His marriage to Margaret, a draper’s sexually precocious daughter, is to remain secret and unconsummated for the first year, as agreed with her father.