As evening falls, Little Firefly grows nervous, as the sky grows dark. His mother, however, reassures him, saying that there is nothing to be afraid of, especially since he carries his own built-in light wherever he goes. She encourages him to "let his light shine," as he begins his nighttime journey. Everywhere he goes, his light reveals the wonders of the nighttime world and the animals in it. Readers can help Little Firefly glow by pressing the special light module built into the book. The story offers a gentle, reassuring message about not being afraid of the dark.