Laurence Yep's novel Dragon's Gate was one of my favorite books when I was a child. One of the pleasures of growing up has been realizing how many other books Yep has written -- including some about the same family, the Youngs, who appear in Dragon's Gate.
I didn't realize until I found Mountain Light that this book (and The Serpent's Children, which I haven't yet read) is not only about the Young family, but about the same characters who appear in Dragon's Gate.
Mountain Light happens when Otter, the protagonist of Dragon's Gate, is a baby. It explains how he came to be adopted by Cassia and Squeaky, and how Squeaky and Otter's father Tiny first went to the United States to work as gold miners.
More than half of the story happens in China, which is good because, as Yep makes clear, contemporary events in China affected the gold miners (and later railroad workers) working in the United States, both as explanations for why they went, and as context for relationships and conflicts among them.
It's also good because Cassia doesn't go with Squeaky and Tiny to the United States, and Cassia is THE BEST.
I would have loved reading about Cassia and Squeaky even without knowing what they were like as older adults (in Dragon's Gate), although that definitely adds something.
Squeaky is the kind of guy who has very little self-confidence, but he knows he can make people laugh, so that's what he does in every situation.
Cassia is Very Very Serious. She always speaks up for justice -- and when she speaks up she Makes a Speech, appealing to the better side of human nature, etc. When this doesn't work, she has a shotgun.
To make things more difficult, their families have been feuding for years. Squeaky and Cassia are only united by a common enemy, and of course at the beginning of their relationship, Squeaky is terrified of Cassia and Cassia finds Squeaky annoying.
But, of course, Cassia decides to allow Squeaky to teach her about the diplomatic uses of humor, and Squeaky lets Cassia convince him that he's allowed to express serious thoughts sometimes. (This has mixed results.)
When they fall in love, Yep keeps it pretty quiet and subtle. This is not a sweeping, passionate romance. Cassia admits her vulnerability to Squeaky. Squeaky inhales the scent of gunpowder that arises from her skin. Cassia makes plans. Squeaky appreciates her excellent, thorough planning...
It's perfect. I think they're my favorite YA couple.