I really liked how much Lady Audley's Secret read like a detective novel (despite pre-dating the detective novel by a good few years).
It's the story of a mystery and a scandal, unfolding through the investigative eyes of the usually bone idle Robert Audley.
It's very Victorian, and you'll either love or hate the flowery language.
Plot twists, melodrama, much better serialised than Dickens! Dragged a bit at times, but still entertaining.