When Kari’s mother brings a mysterious stranger into their home, the ensuing conflict forces Kari to confront the rigid social hierarchies of her futuristic society. Kari, a young woman living in the year 2050, initially views the arrival of a 'Misfit' with suspicion and social disdain. Her objective shifts from maintaining the status quo to uncovering the truth behind the stranger’s identity after the authorities intervene. The narrative follows Kari’s transition from a sheltered life to an active search within the titular Starlight City, navigating a world defined by strict segregation and surveillance.

Readers frequently highlight the accessible prose and the clear moral development of the protagonist as she navigates a complex social landscape. Discussion often centers on the effectiveness of the world-building, specifically how the author establishes the divide between the established citizens and the marginalized Misfits. Critics note that the narrative balances the tension of the search with Kari’s internal realization about the nature of her society. The story is often praised for its focus on the transformative power of compassion in a cold, futuristic setting. Many readers find the pacing appropriate for a young adult audience, providing enough momentum to keep the plot moving without sacrificing character depth.