According to a tweet by Remedy Entertainment, Finnish creator of Alan Wake, its atmospheric horror game will be "removed from stores" (including Steam) on May 15 because of "expiring music licenses."
One of my favourite things in Alan Wake is the song that plays over the end credits of each episode, including Up Jumped The Devil by Nick Cave & the Bad Seeds and In Dreams by Roy Orbison. But it seems the inclusion of these songs has forced Remedy to remove the game from Steam.
The developer is 'celebrating' this news with a so-called Sunset Sale, offering a 90% discount on the game from May 13 (10am PST) until the game vanishes for good on May 15. If you own the game it'll remain in your Steam library, so this is your last chance to grab it before it vanishes.