The Seven-Per-Cent Solution: Being a Reprint from the Reminiscences of John H. Watson, M.D. is a 1974 novel by American writer Nicholas Meyer. It is written as a pastiche of a Sherlock Holmes adventure, and was made into a film of the same name in 1976. The Seven-Per-Cent Solution was ranked ninth in the Publishers Weekly list of bestselling novels from 1974 and made The New York Times Best Seller list for forty weeks between September 15, 1974, and June 22, 1975.