1 September 1939. As the mass evacuation takes place across Britain, thousands of children leave London for the safety of the countryside. But when a little girl vanishes, it's clear that danger can lurk in the quietest village. In the chaos of war, crime novelist Josephine Tey arrives to help her friend DCI Penrose to investigate the girl's disappearance. When a cloud of mistrust falls across the small community she has come to love, events take a sinister turn.