Jerin is nearly sixteen, and soon his sisters will sell him off to other women as a husband so they, too, can buy a husband. But while his slightly older sisters neglect their duty, he helps his younger sisters save an injured princess.
The story starts there, and never stops moving forward. Jerin has been raised unconventionally for his world. He reads, writes, and knows self-defense as well as tactics and strategy. His kind heart and bravery stand him in good stead as he faces moral and physical danger, and overcomes it.
Other reviews have focused on the astonishing world-building Wen Spencer did for A Brother's Price, and then get caught up in the political and moral implications of the world, rather than seeing the story as a very fun tale with a resourceful young hero. Because they disagree with the politics of the story, they have marked the tale lower. It seems to me that this story was written as a reaction to some of the "feminist utopia" fiction that was written in the 1970s and 1980s. It's not so much a "nurture determines all" world as it is a world where everyone is human, with human ambitions, frailties, and gifts.
Although the prose isn't as jewel-like as the Ukiah Oregon books, I still intend to keep this book, and re-read it many times. The story is a rollicking adventure story with a plucky young thing, determined to protect both his new family and his birth family.