This is the fourth of six separate films that combine to form a definitive history of the break up of Yugoslavia. Part four focuses on specific events and political maneuverings in Bosnia and Herzegovina that led to the outbreak of war. The ethnic make-up and history of Bosnia are detailed briefly for context. The tense situation in Sarajevo during late 1991 and early 1992 is focused upon, including footage from the Bosnian parliament showing the heightened political rhetoric and ultimate showdown between the party of Radovan Karadžić, leader of the Bosnian Serbs, and Alija Izetbegović, President of Bosnia and Herzegovina, accompanied by interviews with both politicians. Protestors promoting peace and tolerance are shown being fired on by Karadžić's snipers shortly before the all-out war. Initial outbreaks of the war in the northern cities of Bijeljina and Zvornik are chronicled, pointing out the effects of ethnic cleansing and how it played into the Bosnian Serb agenda. Vojislav Šešelj, paramilitary leader, and other Serbian politicians point to the involvement of the central Serbian government in the Bosnian conflict through paramilitary, military, and logistical support for the Bosnian Serbs. Later events that led to all-out war are also featured, including detailed accounts of events in Sarajevo which led to the Bosnian Serbs' siege of the city, accompanied by interviews with politicians and key players involved, as well as footage from local TV stations.