THE BANK HEIST: an extra in-game mission. As the Master Thief, infiltrate the City’s most secure location, Stonemarket First Bank, to retrieve a coveted heirloom. To this day, the heavily guarded and treacherous place remains impregnable, but that’s about to change… Features Unlock a challenging mission that will put your thieving skills to the test. Outsmart security measures found exclusively in this mission. Search for the Bank’s unique loot and many other secrets! A true homage to the Bank mission in Thief II: The Metal Age.

Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.