The world of Keyfaetuun has four dragons, but never did it have a single unicorn … until the fae guardian of the Kingdom of Zenith, Madame Astrid, took a foal from its mother and fed the foal magic milk, which transformed him. Then she stole a baby girl from her parents and gave the little unicorn to her “daughter” as a pet. But when the daughter grew up and was taken to live in a tower, she said goodbye to her unicorn friend she called Quinn.

After Madame Astrid was punished for breaking the rules. The fae guardianship was passed to Vaino, and he and Quinn, two immortal beings, became friends.

Many years later, when the young princess of Zenith Ivoria suddenly becomes queen young, her loyal knight Draven finds Madame Astrid’s diary. Ivoria starts reading about forbidden magic and how to make it. She orders Draven to capture Quinn the unicorn and bring him to her, then enacts a spell that not even Madame Astrid dared use on Quinn, known as “the only way to truly hold a unicorn.”

Vaino hears about his unicorn friend’s captivity and recruits local farmers and friends Abel and Lacey to help rescue the unicorn from Queen Ivoria’s dungeon. Meanwhile, a guilt-ridden Draven will do anything to try and make up for his imprisonment of the unicorn. Now, those under Queen Ivoria’s gaze will risk her anger, because the only unicorn in the world should not be cursed in a cage.