Who doesn't like a little Lovecraftian horror?
The Sinking City puts you right into the Cthulhu mythos, trying to uncover the mysteries of the fictional town of Oakmont, Massachusetts, during the roaring twenties, which was also the height of Lovecraft's career.
A flood is slowly drowning Oakmont, and you take on the role of a private investigator, there to look into the strange goings on in the town. Only, it's way weirder than you could have imagined. The open world gameplay allows you to get into the mindset of an investigator.
Actually, that's how you progress, through conducting your own investigation, your way.