Pearl Buck, Jewel of the East (The Treasure Chest #3)

the long version

When Felix Robbins gets a crush on Lily Goldstein, a classmate who is adopted from China, he decides to try to take her back in time so that she can see the country where she was born. Maisie discovers his plot, and foils it. But the twins end up in a small village on the Yangtze River, where they meet a girl named Pearl Buck in the days just before the Boxer Rebellion. With bandits chasing them, will they ever find safety . . . and return home? (Alternate title - *Jewel of the East*)