This book is published as a sequel to "Flatland" by Edwin Abbott Abbott, published in 1884, in which all the inhabitants are two dimensional. Stewart, who is a professor of mathematics, created this contemporary guide of a journey through Mathiverse. His main character, Victoria Line, explores the "present understanding of the shape and origins of the universe, the nature of space, time and matter and modern geometrics and their applications." -- Source of annotation: Marvin or Ruth Sackner.