He is ten years old and lives in the basement. A fire has disfigured his family. Ever since his sister had a baby, everyone has been acting particularly strange. And what about the "Grill Man" who lurks at night? The boy's only glimpses of hope are a tiny ray of sunlight coming through the basement window and a few fireflies he keeps in a jar. Their glow gives him the strength to endure his grim life and dream of a better future. But all the doors are locked...