Lady Audley's Secret

Lady Audley's Secret is a sensation novel by Mary Elizabeth
Braddon, written in 1862. It was originally produced in three volumes along with
a serialized magazine version and, later, a single volume edition.

Lady Audley's Secret follows Robert Audley through his detective-like
work in trying to uncover what happened to his friend George Talboys and who his
uncle's wife, Lucy Audley, really is. During his search, Robert has to deal with
lies, deceit, and even an attempt to kill him. Although the novel's content of
bigamy and attempted murder was considered fairly immoral at the time of
publication, it was extremely successful. It has been in print ever since its
first publication.

— Excerpted from Wikipedia, the free encyclopedia.