Criminal investigators race against time, hunting down John Muhammad and Lee Malvo as the pair carry out one of the most terrifying killing sprees in American history: a murderous rampage that left ten dead, three seriously wounded, and the more than 5 million residents living in and around the nation's capital in total shock. The nightmare lasted more than three weeks, during which time the entire nation watched the events unfold, sometimes live, on television. This episode is a comprehensive, analytical account of this unprecedented crime spree. A gripping presentation of the investigation, we probe beneath the surface to explain the events in great detail.