For the past three decades, the United States and Iran have been engaged in an unacknowledged secret war. This conflict has frustrated five American presidents, divided administrations, and repeatedly threatened to bring the two nations to the brink of open warfare. Drawing upon unparalleled access to senior officials and key documents of several U.S. administrations, David Crist, a senior historian in the federal government, breaks new ground on virtually every page of The Twilight War.