Stop! Before you read DRAGONFLY WINGS by Elizabeth Ann Boyles, I highly recommend reading the first novel in the Dragonfly series, THE YEAR OF THE BARBARIAN. Well, yes, you could read Dragonfly Wings as a standalone and enjoy a great read, but you will miss a lot of nuances and interesting details that make this trilogy so good.
So I'll wait. Go read the other book.
Okay, glad you're back. Dragonfly Wings follows the further adventures of Sumi Taguchi, the daughter of a samurai, back in 1859 as the barbarians (aka Westerners) slowly make their way into Japan. Sumi is fascinated by the barbarians, particularly the Americans, but is forbidden by her elders, and indeed by the law, from investigating too closely their ways and religion.
John Cardiff, Nagasaki's first American consul, is desperately trying to understand the Japanese people as he navigates a perilous path between America, Japan, his shipping company, and his fiancée back home. Sumi and her father act as his translators and guides.
If you enjoy immersing yourself in another culture and time, this is the book (the trilogy!) for you. I read it in two days, neglecting work and family, because I just had to know what was happening next. It is well written and fascinating. By the way, the author, Elizabeth Ann Boyles, won both the ACFW national Genesis award and the ACFW Virginia Crown award for historical / historical romance. The woman knows how to write.