Several years ago, I read a book by the author Jon Ronson, The Psychopath Test: A Journey Through the Madness Industry. I discuss this more in the companion post. Ronson is an interesting author who mixes investigative journalism and personal narration, so the reader feels they are discovering things in real time with the author. Whilst reading the book, I learned about another book which I never realised was so important. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR) or more commonly known as the DSM-5 appeared to be an influential work that not many people know about.