1995年４月19日、アメリカのオクラホマシティにあるマラー連邦政府ビルで爆発が起きた。９階建てのビルの大部分が崩壊する程の威力を持った爆発で、オクラホマの人々は大混乱に陥る。閉じ込められた人々を救出するため救助隊は時間との戦いを繰り広げる。続々とケガ人が運び出される中、メディアは現場の状況を伝え、ＦＢＩは総力を挙げて捜査を開始する。生還者や遺族、救助隊のインタビューと共に事件の当日を振り返る。

Reports of a second explosive cause mass panic and an evacuation is ordered. Fighting their instincts, first responders must leave survivors trapped and fearing for their lives. The country questions who would strike a federal building in the heartland as the FBI launches a nationwide search to find those responsible for the worst domestic terrorist attack in American history.

President Clinton arrives in Oklahoma as grieving families come together to remember those they have lost. The nation grapples with the reality that the bomber is an American veteran who shows no remorse. As the trial begins, the government seeks the death penalty for the worst domestic terrorist attack in U.S. history.