In the far future, during the era of LUX, the sun no longer shines.
Humanity survives on energy stored inside hovering monoliths, while people battle strange light-deficient illnesses. Stories about why the sun went dark are told in classrooms, but no one knows if they're true.

Finnegan, a curious boy, longs to help his little sister, Shine. His search carries him from light clinics and healing gardens to the Photon Lab, where prisms and mirrors reveal the science of illumination. Guided by bioluminescent dragonflies and entrusted with two enchanted stones, he must cross a labyrinth to reach Mad Magnus and the forbidden Spectra-Oracle-a magical telescope said to reveal the secrets of the universe. Along the way he finds help in unexpected places: glowing dragonflies, a teacher who believes in him, and stones that hold a mysterious power.

What begins as a boy's effort to heal his sister grows into something greater-an adventure that asks if courage, hope, and the light we share together can change the fate of an entire world