Washington-based national security reporter Eric Tucker delivered an exclusive, deeply reported account of how the Department of Justice’s biggest terrorism prosecution in years almost didn't happen. The case involves two alleged Islamic State militants dubbed “The Beatles,” British citizens blamed for the jailing, torture and murder of Western hostages in Syria.

Tucker spoke to roughly a dozen current and former U.S. and British officials — many of whom rarely, if ever, grant interviews — as well as relatives of slain hostages. The story broke news in several areas, revealing for the first time how grieving families reached a gradual consensus to take the death penalty off the table, the behind-the-scenes involvement of current and former FBI officials who encouraged the families to prod the administration into action, and never-before-seen email correspondence from a senior Justice Department official to one of the victims’ relatives.

Tucker also revealed how U.S. officials had decided that they would not pursue the case if they did not receive evidence from the British, who balked at providing their evidence if the death penalty was an option.