Question: Decipher, Inc. is an American gaming company based in Norfolk, Virginia, US, since 2002, Decipher has released two licensed role-playing games: "Star Trek RPG" and "The Lord of the Rings Roleplaying Game", released by Decipher Inc. in 2002, is a role-playing game set in the Middle-earth of which author's fiction? 
Sentence (from "Decipher, Inc."): Their longest-running offering is the "How to Host a Murder" Mystery series.
Relevant evidence: No