The book "Never Again! A Protest and Warning to the Peoples of Europe" by Edward Carpenter is a powerful publication that calls for reflection on the future of Europe after the terrible consequences of the First World War. The author makes a strong protest against war, violence and senseless expansion, and gives a clear warning about the consequences of imperialism. Carpenter candidly reveals the social and political problems of the time that could have led to the disaster, and calls for the unification of nations to ensure peace, solidarity and cooperation. This book analyzes in detail the causes of war and suggests constructive ways to resolve conflicts in order to prevent similar tragedies in the future. "Never again! A protest and a warning addressed to the peoples of Europe" is an important book that leaves the reader thinking about how to change the world for the better.