The Riddle of the Rhine: Chemical Strategy in Peace and War is a book written by Victor Lefebvre that examines the impact of the chemical industry on European history during the First World War. The author reveals important aspects of the use of chemical weapons, noting the key role of the Rhine region in this field. Lefebvre describes in detail the technologies for the production of poisonous gases, their impact on hostilities and national security. In addition, he analyzes the strategic decisions related to the chemical industry that led to changes in international relations. This book will be a valuable source of information for those interested in military history and the development of the chemical industry in the context of global conflicts."