The official community and development server for popular Hearts of Iron 4 mod Darkest Hour. Darkest Hour is a total overhaul mod for Hearts of Iron IV. Beginning in 1933, the world is still reeling from the effects of the 1929 Wall Street Crash. With the rise of extremism in Europe, the uneasy peace that ended the Great War appears to be on the verge of unravelling, and the world's nations vie for their place in the sun.