http://www.novelupdates.com/series/terror-paradise/ A novel about a VR Horror game called Terror Paradise. It has RPG elements (levels, stats, skills, items, etc...), although I'm not sure if I would call it an MMO... there's multiplayer, but no "open world" to run around in. Players are put into teams and sent into unique instances to complete quests. These instances are a bit like being dropping into an ongoing horror movie. For example, you might spawn in an abandoned building and be told that you're being hunted by a monster -- completing the quest would require either defeating the monster or escaping the building alive. The novel's MC is a young man who, due to a brain injury, can no longer feel "fear". He's also very intelligent and uses deductive reasoning to solve the game's quests in interesting ways. The author modeled him after Sherlock Holmes, apparently.