Shanghai Girls by Lisa See

In 1937 Shanghai—the Paris of Asia—twenty-one-year-old Pearl Chin and her younger sister, May, are having the time of their lives. Both are beautiful, modern, and carefree—until the day their father tells them that he has gambled away their wealth. To repay his debts, he must sell the girls as wives to suitors who have traveled from Los Angeles to find Chinese brides. As Japanese bombs fall on their beloved city, Pearl and May set out on the journey of a lifetime, from the Chinese countryside to the shores of America.