National Sunday Law by A. Jan Marcussen. No ISBN. This booklet is being mail to people in the United States. This book purports to explain future events based on the Book of Revelation. The style is sensational, for example, on the cover it says "A Shocking Glimpse Behind the Scenes" and "Forces unite amid stupendous crisis...". The author is a Seventh-day Adventist. He is against the so called "National Sunday Law" (see here for example Lord's Day Act or here
Lord' Day Alliance.) His theory is that the Pope and the United States of America are two beasts from the Book of Revelation that are going to help Satan ruin the lives of millions by causing them to worship the Sun instead of G-D. The book can be obtained from websites like this.

Everything and More: A Compact History of ∞, By David Foster Wallace. ISBN 978-0-393-32629-1. This a really good book. A bit eccentric in style, but it works because the subject, infinity, is so complex. The story is mainly of Cantor's work in the modern theory of infinity, but it covers stuff from all periods of history, e.g., Zeno and other ancient Greeks to European mathematics of the 1600's and the discovery of Calculus (Leibniz and Newton.)
This book touches on many complex mathematical ideas, but doesn't get too bogged down with proofs, etc.