It was written by Rhonda Byrne and claims to be based on the teachings of the ancient "Law of Attraction," which suggests that positive thoughts and feelings attract positive experiences into one's life. While the book presents itself as a factual guide to achieving success and happiness, it's important to note that the Law of Attraction is not scientifically proven.
Therefore, while "Secret" is presented as nonfiction, its claims are not universally accepted as factual.