Based on the real-life detonation of a 50-megaton thermonuclear bomb by the Soviet Union in 1961 – the largest explosion in history – the novel tells the story of the unearthing of a second such 100-megaton “Czar Bomb” hidden decades ago. The bomb was searched out by billionaire Iraqi oligarch, Saadallah bin Shadid, who is seeking revenge for the death of his family in an illegal American drone strike. CIA nuclear weapons expert Carrie deLong and her team, and military historian Ben Webber must stop the terrorists before they detonate the superbomb, killing millions.