Everyone interested in old books and/or the origins of the heliocentric world view will find this book interesting. While not a page turner like a well written novel, the book is nevertheless an interesting read. The author describes his 30 year hunt of the remaining copies of "De Revolutionibus", the book written and published in the 16th century by Nicolaus Copernicus detailing how, contrary to popular belief at the time, the earth and the planets revolve around the sun. Gingerich describes his detective work to find the books. He takes us along when interpreting the marginal notes, which sometimes show how scientists used the book at the time and learned from each other by even copying those notes. Because the book is rare today, it is much sought after by collectors and invites for fraud and stealing. Some of the anecdotes describe how Gingerich helped to get stolen books back to their owner. Worth a read.