Three young friends, Kevin, Caro, and Eva, who are passionate about caving, decide to explore the ruins of an abandoned mine. They discover, bathed in the light of dawn, a surreal setting to explore. As soon as they enter, they take a dizzying fall through a poorly sealed well. Now trapped at the bottom of an abyss where not a ray of light reaches, they have only one thing to do: wait for help and survive. Victims of their anxiety, they begin to lose their bearings. Fear and madness set in, making it impossible to discern reality from illusion. Sunlight tells an agonizing survival story penned by French screenwriter Christophe Bec and illustrated by Bernard Khattou.