Strange Case of Dr. Jekyll and Mr. Hyde, by Robert Louis Stevenson -- no synopsis needed
Gods of Death, by Yaron Svoray -- a supposedly non-fictional account of the author's (a former Israeli journalist) attempts to track down and infiltrate a ring of snuff filmmakers. Sensationalistic and not always believable, the author found himself compelled to investigate snuff films after having allegedly seen a real one while infiltrating a Neo-Nazi party for his previous book.
And while the author insists he once showed an actual snuff film to Robert Deniro as research for a movie, he very suspiciously cannot provide any form of genuine proof the films, or the "ring" he was supposedly investigating, even exist. True or not, plausible or not, the book nevertheless contains a number of riveting, nerve-wracking, terrifying moments which, if the story were true, the author was luck as fuck he lived to write about.