"Elementary, my dear Watson" is a phrase that is never truly said within the Conan Doyle books of Sherlock Holmes.

The statement "elementary, my dear Watson" is actually not found in any of the original stories written by Sir Arthur Conan Doyle featuring Sherlock Holmes. This popular phrase is a later addition that has been widely associated with the character through various adaptations and portrayals in other media, such as movies and television shows. Hence, it is true that the phrase is never truly said within the Conan Doyle books of Sherlock Holmes.