Grab Peaky Blinders: Mastermind Steam Keys for free via Fanatical! Simply subscribe to their email newsletter and link a valid Steam account to pick up your Steam key. Peaky Blinders: Mastermind is a puzzle-adventure game based on the TV show.
EDIT: Please note this giveaway is not available in some countries.
1. Login into your Fanatical account and subscribe to their newsletter
2. Link a valid Steam account and unlock your Steam key!
3. Launch the Steam client and click the Games menu option.
4. Choose "Activate a Product on Steam" to redeem your Steam key.