London October 1940. Dot is finding her independence and takes a full-time role as an ARP warden. As she finds new courage in the blackouts her past might still be lurking in the shadows. . .Peggy makes it her mission to help children caught up in the bombing find safety at her parents' country house. When she returns home however she realises her own family need her more than ever. But can she leave her friends in the line of fire? Vivian spends every moment not behind the wheel of her ambulance at the bedside of the man she loves. When she is torn between his hospital ward and the site of the latest blast she faces a heartbreaking choice. As each night becomes more dangerous for the Blitz Girls will they have the strength to keep the light alive in the darkness?