This book offers an enjoyable ride through a lovely landscape of Superstring theory/M theory. The author is an active researcher and a popular writer in this field who is also known for his presentation on PBS's NOVA about quantum cosmology. Since the postulation of special theory of relativity, Einstein and subsequent physicists have struggled to explain the four natural forces of the most basic components of matter; the electromagnetic force; the strong and weak nuclear forces; and the gravitational force by one unified field theory (a.k.a., theory of everything: Superstring/M Theory). This theory must unify the forces of the cosmos, and forces of microcosm thereby explaining the creation of heaven and earth. The author covers significant amount of material in simple clearly written non-technical and non-mathematical form. The book is described in four parts; first two parts introduces theory of relativity and quantum mechanics and the unholy marriage of the two that results in the complexity of understanding the forces of the cosmos and subatomic forces. The latter two parts describes Superstring theory that evolves into more focused M theory to explain all physical forces of nature. This theory suffers from lack of experimental evidence, but rests solely on mathematical calculations.  Hence it was subjected to heavy criticism during early years of the theory by leading physicists. However it has emerged as a winner as the theory grew out of academic obscurity to leading contender in quantum cosmology. The book has interesting tales about the leaders of the field such as Ed Witten who is strongly favored as the true successor of Albert Einstein. The author's enthusiasm and excitement about his involvement in this field is evident abundantly, when he discovers that fabric of space tears and repairs itself. This book is lot more informative and enjoyable than Michio Kaku's Hyperspace (see my review of this book). At the end of the book, notes to each chapter, Glossary of scientific terms, and suggested books for further reading offers stepping stones to more enthusiastic readers for furthering their knowledge. The author has done an excellent job of writing this book, and I encourage you to buy it: But he could have considered writing a chapter on mathematical methodology and some basic approaches to calculations that probably would have made this book one of the top few in this field.