It is amazing to think that a book published 57 years ago is still an international best-seller. Not only that but the book has been translated into 53 languages and has sold over 21 million copies! The book is Dianetics: The Modern Science of Mental Health. The reason for its success is that the techniques described in the book work and bring about a vast improvement in your life, relationships and viewpoint.
As L. Ron Hubbard wrote in the book's introduction: "Dianetics is an adventure. It is an exploration into terra incognita, the human mind, that vast and hitherto unknown realm half an inch back of our foreheads. Some of the things you will find may astonish you."
From personal experience I can tell you that Dianetics sure is an adventure and (although it sounds like a cliche, it's true) it's a life changer. So get the book, read it, apply it and, as LRH says in the intro to the book, "May you never be the same again."