One evening Harold decided to go for a walk in the moonlight. But there wasn't any moon, and Harold needed a moon for a walk in the moonlight. Fortunately, he had brought his purple crayon. So he drew a moon. He also needed something to walk on. So he drew a path...

And thus begins one of the most imaginative and enchanting adventures in all of children's books. The creative concept behind this beloved story has intrigued children and kept them absorbed for generations, as page by page unfolds the dramatic and clever adventures of Harold and his purple crayon.