A gripping fantasy novel that follows the life of Fang Runin, or Rin, an orphan determined to escape her cruel circumstances through a grueling test to attend a prestigious military academy. 

The story seamlessly combines elements of a fantasy boarding school tale with the darkness of a looming war. Rin, with her ruthless determination, is a compelling protagonist, and the book's cast surprises with complex character arcs. 

The worldbuilding is rich, drawing inspiration from Chinese history, and the magic system is inventive.