His book is a sustained attack on what he sees as the illegitimate claims of C.G. Jung and his disciples to have founded a genuine system of psychotherapy (analytical psychology). In reality, he thinks, Jung was a magus, a purveyor of religious mysticism based in occultism, neo-paganism (including sun-worship), and völkisch movements similar to those that were later adopted by the Nazis (anti-Semitism comes in here as well). Analytical psychology, the system of treatment founded by Jung, is a cult, not a scientifically based therapy.