This is another dark YA dystopia, this one set in a bleak world divided into the Reds and Silvers, where the reds (who bleed red blood) are the underlass to the Silvers, who bleed silver blood and have special powers. When Mare, our heroine, a teen girl slated for conscription into the ongoing war, is swept abruptly in the Silver world, she suddenly has the potential to make extraordinary change.
This has wonderful world building, but the unrelenting grimness becomes oppressive well before the end of the book. That said, it still kept me frantically turning pages as the plot drove forward with some truly terrifying political intrigue. For 16 and up for violence.