Thundersqueak is a rant, a polemic, a revolutionary manifesto and, in simple terms, a book of instructions for freeing the soul and living a better, or more interesting, life. In places it is a dialogue between two contrasting aspects of the author's personality. Written in three weeks in 1978, six months after the author completed the Abramelin Operation, it leads the reader through the dark night of the soul to the paradoxical dawn of hope. Many people claim that this book changed their lives. It has also been described as "a good book to reader when you are young and feeling angry"