In 1894, French Captain Alfred Dreyfus, a young promising officer, is degraded for spying for Germany, wrongfully convicted of treason and sentenced to life imprisonment at Devil's Island. Among the witnesses to his humiliation is Georges Picquart, who is promoted to run the military counter-intelligence unit that tracked him down. But when Picquart discovers that secrets are still being handed over to the Germans, he is drawn into a dangerous labyrinth of deceit and corruption that threatens not just his honor but his life.