Using elaborate re-enactments, fascinating Computer Generated Imagery and previously unseen archive footage the programme examines how the assassination in Sarajevo in 1914 came about and how Austria-Hungary used the death of the heir to the throne, Franz Ferdinand, to start a war against Serbia. The film investigates how this regional conflict caused the Central Powers and the Triple Entente to enter the First World War - at the time, the biggest war in history with 17 million soldiers and civilians killed and more than 20 million injured.
Guided by historians deciphering the Vatican's rich archives following recent restorations and excavations, the Vatican delivers new untold secrets and reveals a fascinating historical saga.
