"The Ninth" is an exciting thriller that keeps you in suspense from the first pages to the last. The author of the book, Leni Wilkenson, successfully combined the elements of detective, mysticism and psychological tension. The main character, detective David Stillman, delves into the case of a serial killer who leaves behind mysterious traces. The events of the book develop quickly, revealing to the reader unexpected plot twists and leaving him in suspense until the last page. "The Ninth" is a book that will capture your imagination and not let go until the last word.