There were four of the Thorpe family in the Anderson shelter the night of the raid on Coventry. Mum and Dad, Florrie and little May. Jack was missing... he was one of those who did not return from Dunkirk. When Daisy and Marcus, sixth formers in Coventry, are given a project on the bombing of the city in 1940, they go to talk to May, now living in sheltered accommodation but full of memories of the war. The two youngsters both have their problems and as their lives unfold they strike up an unlikely friendship and become involved in the strange history of May's missing brother and of a promise made all those years ago which still has its repercussions today.