A six-year-old boy in the British immigrant community of Whitechapel believes he has discovered a unicorn for sale at the market. Though it looks to most people like a white goat with a bump on its head, young Joe is certain it will make the dreams of his friends and neighbors come true—a reunion with his father in Africa, a steam press for a tailor shop, a ring for a girlfriend. Others may be skeptical of the unicorn’s magic, but with enough effort, Joe believes he can make it all real.