"Un voluntario realista" is the work of the famous Spanish writer Benito Perez Galdos, who is considered one of the greatest masters of realistic prose. This book tells the story of the main character, who volunteers in the ranks of the Catholic army during the Spanish Civil War of the 19th century. The author explores the complex moral dilemmas that arise in the main character during the war, and also shows the reflection of political events on the lives of ordinary people. "Un voluntario realista" is a fascinating novel that not only reveals historical events, but also invites the reader to think about eternal values and the power of the human spirit.