War Book is a 2014 British political drama film directed by Tom Harper and written by Jack Thorne.

[2] In the depicted meetings, set in 2014, the group discusses possible UK policy in the fictional event of a nuclear detonation in Mumbai, India by a Pakistani organisation.

[6] Variety's Charles Gant found the film's dialogue somewhat theatrical and compared it to Roger Donaldson’s Thirteen Days, which proved that "a talkathon rooted in a historical moment of genuine peril can be far more gripping than any invented drama, and many audiences may find the final act of "War Book" to be risibly paranoid by comparison.

"[3] The Guardian's Mike McCahill felt that "theatricality looms, but the variation of voices and viewpoints among the expert cast generates a rat-a-tat momentum.

"[7] The List's Nikki Baughan was much more enthusiastic, comparing it to Sidney Lumet's 1957 classic Twelve Angry Men, stating that "Jack Thorne's remarkable script is a masterclass in slow-burn tension, combining black-and-white facts with the murky greys of human emotion to drive home the fragility of social order in the face of incoming warheads.