If your PC is worthy enough to play Metro: Last Light, we have good news for you. Not only will you be getting the best-looking version of the game, but you'll also be getting a special digital bonus not found in the console release. New publisher Deep Silver has announced that Last Light will include a free digital copy of the Metro 2033 novel.
The Kindle version of the novel is available for $4.99, and is oddly described as "the novel behind the Metro: Last Light video game" (and not the original Metro 2033, for some reason).
Deep Silver also wanted to point out that the next novel in the franchise from Dmitry Glukhovsky, Metro 2035, will be available later this year.