1945 Zero hour. Europe is reduced to rubble. Thirty million displaced and uprooted people. At the heart of this ravaged continent lies Switzerland. This small neutral country, which has been all but spared by the war, becomes a hub for Nazi war criminals, Allied Secret Services and Holocaust survivors.

In the spring of 1873, people from all over the world come to the tiny village of Göschenen in the canton of Uri, to work on the biggest and most spectacular construction site of modern times: the tunnel through the Gotthard.