A young boy creates an imaginary world filled with zooming cars, flashing traffic lights, and racing fire engines.

Meet Greenlight! Greenlight has an important job to do, but every time it's her turn to shine . . . everyone drives away! The cars stop for Redlight and slow for Yellowlight, so why do they leave Greenlight all alone? When Greenlight decides to stop shining altogether, will she be able to find the power and connection of her own light?