At Frostgrave Keep, the feared Duke Kael Varynth seeks a personal knight to protect his young heir, Lucien. Warriors from across the kingdom answer the call—including (Y/N). But (Y/N) hides a dangerous secret: she is the daughter of a fallen general disguised as a male knight. To win the role, she must survive brutal trials, rival candidates, and the cold scrutiny of the North without revealing who she truly is.