Fall 1924, Corto had to find his friend Steiner in Berlin. But when he arrived in the German capital, he discovered that his friend had been murdered! He then launched an investigation to find his murderer, and to obtain, if not justice, at least revenge. But the fragile Weimar republic is already on the brink of civil war, between communist spies and secret society of far right, and they all seem to want to prevent him from achieving his ends...