At the moment Prime Minister Neville Chamberlain broadcasts to the nation Britain’s declaration of war with Germany, a senior Secret Service agent breaks into Maisie Dobbs' flat to await her return. Dr. Francesca Thomas has an urgent assignment for Maisie: to find the killer of a man who escaped occupied Belgium as a boy, some 23 years earlier during the Great War. In a London shadowed by barrage balloons, bomb shelters and the threat of invasion, within days another former Belgian refugee is found murdered. As Maisie’s search for the killer escalates, the country braces for what is to come. Britain is approaching its gravest hour --- and Maisie could be nearing a crossroads of her own.