https://www.gamespot.com/articles/get-a-free-steam-pc-game-now-but-hurry/1100-6461217/

Between now and August 18, while supplies last, you can pick up a free PC game from the Humble Store. The game is Orwell, and it arrives in the form of a Steam code that's playable on Windows, Mac, and Linux. Anyone who claims a free copy will also get a 10% off coupon for Humble Monthly.

Orwell begins with a bomb going off. You assume the role of an investigator tasked with catching the person or people responsible. To work the case, you must comb through suspects' social media posts, bank accounts, dating site profiles, and communication records to find hints about who's responsible. As you investigate, you upload relevant details into a surveillance program called Orwell.