Cesare Cantu's The Sacred Difference in Valtellina is a unique study of the history and culture of the religious conflict that took place in Italy at the end of the 16th century. The author examines in detail the events of the Holy Massacre in Valtellina, when Protestants were brutally persecuted by Roman Catholics. The book highlights the causes of the conflict, the chronology of events and their consequences, which had a great impact on the history of Italy and the understanding of religious conflicts in Europe. The author draws attention to the religious, cultural and political aspects of this tragic period of Italian history. This book will be a valuable source of information for those interested in the history of the Reformation and the influence of religion on society.