Identical twins Lily and Rose Flowers aren't from a rich family, but they lead a comfortable life in 1920s Rotherhithe with their mum and dad. The twins are the apple of their parents' eye, and each other's best friend - they always know what the other is thinking. Feisty Rose has a more rebellious nature than her sister, but it's never before interfered with their closeness. However, Rose's secret dissatisfaction with her humdrum lifestyle reaches a head when she meets the rich and handsome Rodger. To the shock of the Flowers family, she elopes with him to Gretna Green. Once Rose has the money and glamour she's always craved, nothing will persuade her to contact her family again; not even her father's death. But then, in the wake of the Wall Street Crash of 1929, everything changes.