So far, this is my least favorite book in this series. Astrology is just not a very interesting topic and it definitely does not qualify as "mysterious" to me.
As usual with Time-Life books, this is an excellent objective review of the history and components of a subject that is controversial. Whether you believe in astrology or not, this book details the influential thinkers on the study of the planets and universe in a fascinating manner that does not come across as favorable or skeptical.