The Woman in White by Wilkie Collins

Amazon | Project Gutenberg
There, in the middle of the broad bright high-road—there, as if it had that moment sprung out of the earth or dropped from the heaven—stood the figure of a solitary Woman, dressed from head to foot in white garments...
A suspenseful, melodramatic Victorian page-turner, narrated in turn by a succession of different characters caught up in a sinister plot surrounding the mysterious, troubled woman in white. Once started, you won't be able to put it down!