This is the second in a series, but you don't have to read the first one to understand this book. Though it might help? I don't know; I've only read this one.
It's an average middle grade book. The mystery isn't that compelling and the characters are a bit annoying after 100 pages (though I did like Aunt Lil). The main conflict between the native-born and foreign-born Chinese kids is too heavy handed. Also, the terms native-born (for the kids born in America) and foreign-born (for the kids born in China) seem backwards, but maybe those are the terms people used? I'm not sure, but from the attitudes of the people who use them it seems like the kids born in America should be called foreign-born and the kids born in China should be called native-born.
The book also has some '90s computer magic (kid with a computer can hack anything, all the records they need just happen to be digitized, etc). Think the early seasons of Buffy.
All in all, not Yep's best. I'd skip this series in favor of his Golden Mountain Chronicles.