•Why it earns a slot
Why it earns a slot: it built the sensation novel and courtroom-style detective fiction from dueling first-person testimonies, each narrator writing only what they could personally swear to.
A stranger in white stops Walter Hartright on a midnight road, and her resemblance to an heiress becomes the hinge of a plot to fake one woman's death and steal the other's identity.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.