Manchester, 1940. By day, Betty works cheerfully with her best friend Sally, now the manager of the salvage depot. By night, they both do their bit for the war effort as Auxiliary Fire Service girls. But Betty wishes she could do more. So when Samuel, a kind and gentle young bookseller, needs help sorting out novels to entertain the boys overseas, Betty volunteers. Anything for the troops! But then Sally's home is destroyed, and her surviving possessions stolen by looters. Desperate to help her friend, Betty could never have expected the guilt when she uncovers what really happened. . . Determined to set things right, Betty sets off to catch the thief. And then the sirens begin, warning of another bombing raid. Can Betty find the strength to finish what she started, despite the threat to everything she holds dear?