Comtesse Emilie Marchand is more at home holding scalpels than knitting needles and is desperate to escape her noble roots and serve her country as a physician. But society dictates a lady cannot perform such gruesome work.

Annette Boucher, first-born daughter and least-loved child, wants more for her life, desperate to be trained so her magic can reach its full potential. So when a strange noble girl offers Annette the chance of a lifetime, she accepts.

Emilie and Annette swap lives—Annette attends finishing school to become a lady and trained in the ways of divination, while Emilie enrolls to be a surgeon, using her natural magical talent to save lives.

But when their nation is the aggressor in a frivolous war, Emilie and Annette must work together to help the rebellion end a war that is based on lies.