The TPBCMG book for December is The Woman in White by Wilkie Collins. The novel was the author's fifth published novel, written in 1859, and first published serially. It is considered to be among the first mystery novels and is widely regarded as one of the first (and finest) in the genre of "sensation novels."
The story is sometimes considered an early example of detective fiction with the hero, Walter Hartright, employing many of the sleuthing techniques of later private detectives. The use of multiple narrators draws on Collins's legal training, and as he points out in his Preamble: "the story here presented will be told by more than one pen, as the story of an offence against the laws is told in Court by more than one witness."
The book is available in many editions, including free eBook (link to Project Gutenberg).
If more than 12 people show up, we will break into two groups and I will ask for a volunteer to moderate the second group.