The book is a historical novel that recounts the War of Canudos, a conflict in late 19th-century Brazil over religious fanaticism, political instability, and social inequality. The story is centered around an apocalyptic movement led by a charismatic, messianic figure who convinces the poor and downtrodden to rise up against the Brazilian government, leading to a brutal and bloody conflict. The book explores themes of faith, power, poverty, and the destructive potential of fervent belief.