The bomb was our strength. Our secret weapon. Set in post-war Britain, the story follows 11-year-old Andy and his three friends as they experience a growing-up summer before going on to secondary school. A misunderstanding on the last day at primary school, which results in a terrible injustice, sparks off anger and frustration in the four boys which, after the discovery of an unexploded bomb, leads to an awful life-changing decision.