Sun and Moon have always held their own places in the sky, but after a lifetime of darkness all Moon wants is to spend just one day as Sun. Sun agrees, but only if first Moon takes a careful look at his night, before making his final decision. Follow Moon as he travels through the dark discovering enchanting animals and scenes unique to the night-time, foxes hunting, children dreaming, lamplighters and fireflies. Will Moon still wish to trade Sun places in the sky? Or will he realise the beauty of what he already has?