The Three Kingdoms are at war, but Meilin's father refuses to answer the imperial draft. Trapped by his opium addiction, he plans to sell Meilin for her dowry instead - but when she discovers that her husband-to-be is violent and ill-tempered, she decides to take matters into her own hands.
The very next day, she disguises herself as a boy and enlists in her father's place.
In the army, Meilin's hard work brings her recognition, friendship - and a growing closeness with Sky, a prince turned training partner.
But as her kingdom barrels towards destruction, Meilin must decide who to trust: Sky, who inspires her loyalty and love; a sea dragon spirit with the power to grant her impossible magic; or an infuriating enemy prince who makes her question everything she once knew - about her kingdom, her loyalty and her own heart.