Chris Cleave opens his forth novel with a sentence that sums up his main character: “War was declared at 11:15 and Mary North signed up at noon”. Mary does not get what she expects, ending up in the teaching service and helping to evacuate children from London to the countryside. Mary is just one of the rounded and unforgettable characters in Cleave’s new novel set in the first half of World War Two. But she is the heart and soul of this work – a jaunty but fierce, undaunted young woman trying to find her way in a world that is coming apart around her. Mary is not the only character that Cleave follows into the war. There is Mary’s best friend Hilda, her new boss Tom, who is happy not to fight, and his friend Alistair Heath, an art conservator with the Tate who has gone to war and ends up defending Malta from the Germans. Also trying to survive the war is ten year old American boy Zachary. Zachary is African American and does not fare well when evacuated to the country with the other children. Zachary ends up back in London during the Blitz with his father…