After surviving the devastation of the Blitzkrieg, Karski swears allegiance to the Polish Underground and risks his life to carry the first eyewitness reports of war-torn Poland to the Western world, and ultimately, the Oval Office. Escaping a Gestapo prison, bearing witness to the despair of the Warsaw ghetto and confronted by the inhumanity of a death camp, Karski endures unspeakable mental anguish and physical torture to stand tall in the halls of power and speak the truth.