"Protestant Ethic and the Spirit of Capitalism" by Max Weber, published by Penguin Classics, is a groundbreaking work on the relationship between religion and capitalism. This nonfiction book, originally written in German and translated into English, explores the role of Protestantism in shaping capitalist ideologies and practices. With a focus on religious, social science, and philosophical themes, this book is a must-read for anyone interested in the intersection of faith and economics.