What book was field of dreams based on?

The movie "Field of Dreams" is not based on a specific book. It was inspired by a short story called "Shoeless Joe" by W. P. Kinsella, which he later expanded into a novel of the same name.

While the movie shares the same basic premise as the novel – a farmer building a baseball field in his cornfield in hopes of attracting the ghosts of baseball players – the movie takes significant liberties with the plot and characters, ultimately creating its own unique story.

So, while "Shoeless Joe" was a major inspiration for "Field of Dreams," the movie is not a direct adaptation of the book.