When war broke out, 17-year-old Christie could have stayed down on the family farm in Norfolk, where she was wanted and needed. So why had she joined up? Come to that, why had Meg from Cheshire, and Sue, very much the big city girl from Liverpool, and Shanna, the life-toughened product of a broken home in Glasgow? Mixed reasons. Very mixed backgrounds. But no time to think now. Not with the sergeant shouting and the station air-raid siren beginning to wail . . .