It tells the story of identical twins Grayce, a transgender girl, and Hawke, a cisgender boy, who have to flee from their home when their cousin stages a coup on the kingdom and kills the rest of their family.

Smith's debut middle grade novel was published on January 7, 2020 by a Little, Brown and Company imprint, and was received positively by critics, who praised the writer's worldbuilding and the novel's affirmative look on transgender identity.

Next day, their grandfather is supposed to name their older cousin Reyden as heir to the House of Sunderlay, but a distant relative Mirelle stages a coup with her military unit and a mysterious hooded woman, planning to kill everyone above her in the succession order and burning a blue tapestry with family's tree.

The twins adjust differently - Hawke dislikes having to keep up the disguise and the unarmed combat technique of the Communion's guardians and wants to defeat Mirelle, while Grayce enjoys the sisterhood, her spinning role and wants to stay.

[1] Publishers Weekly praised the "anime-inspired illustrations" by Smith, including the facial expressions shown by the characters, as well as the "capable worldbuilding and a positive look at transgender identity" present in the novel.

[3] Kiri Palm, for the Bulletin of the Center for Children's Books said the novel "offers a refreshing spin on the crossdressing-for-noble-reasons trope" due to Grayce's story of self-discovery as a trans woman.