Attempts to move the idea of the enneagram from a mostly spiritual idea into one more grounded in psychology. There's still plenty of spiritual jargon present, but I found this more digestible than most enneagram descriptions. Theres also a really detailed test in the book to help you determine your type, though there are always pitfalls to such tests. It's labelled me as a type 4 with a 5 wing, which may or may not be true. It's hard to say for sure. Still an interesting read and very accessible.