The whole theme of the book is expressed in one short quote: "The Thames made London." It is a declaration of love from the author to his city and its great river. The book examines the relationship between the Thames and the city in nearly forensic detail. It shows how they influence and shape each other. Besides, the author analyzes other European cities, their prominent rivers, and how they influenced the development of their politics, economy, and culture. That is why, it gives an excellent opportunity to look at London and Europe at the beginning of the 20th century before wars and political turmoilaffected them.