Lily must reconcile her human life and her destiny as a mermaid princess. Lily, a seventeen-year-old who is half-mermaid and half-human, navigates the complexities of high school and a burgeoning crush on a human boy. She fears revealing her true identity and her impending responsibility as the ruler of the undersea kingdom of Thalassinia. The narrative framework appears to be third-person limited, focusing on Lily's internal struggles and external challenges.

The premise sets up a classic young adult fantasy romance, exploring themes of identity and belonging. The narrative likely focuses on Lily's internal conflict as she navigates her feelings for a human while facing the responsibilities of her royal lineage. Readers can expect a blend of high school drama and underwater adventure, with a focus on the challenges of bridging two disparate worlds. The story appears to be structured to appeal to fans of mermaid lore and coming-of-age stories.