According to a leaked email from Valve, it's time to empty all our wallets and buy more games than we'll ever have time to play (hey, it is a legit problem). Their annual Halloween sale seems set to start on October 30, and they are inviting developers to add their games to the sale if they include: ""horror, zombies, ghosts, vampires, survival horror, dark, and so on."
If you're looking into buying new games with a dark theme of any kind, then it might be a good idea to wait until the end of the month, just in case..