Late in the 20th century, in response to repeated mass atrocities around the world, more than 120 countries united to form the International Criminal Court (ICC)—the first permanent court created to prosecute perpetrators (no matter how powerful) of crimes against humanity, war crimes, and genocide. The Reckoning follows dynamic ICC Prosecutor Luis Moreno Ocampo and his team for 3 years across 4 continents as he issues arrest warrants for Lord’s Resistance Army leaders in Uganda, puts Congolese warlords on trial, shakes up the Colombian justice system, and charges Sudan’s President Omar al-Bashir with genocide in Darfur, challenging the UN Security Council to arrest him. Building cases against genocidal criminals presents huge challenges, and the Prosecutor has a mandate but no police force. At every turn, he must pressure the international community to muster political will for the cause.