"Heretics" by G. K. Chesterton is a critical examination and philosophical treatise written in the early 20th century. The book addresses the moral and intellectual confusion of modern society, particularly the shifting definitions and attitudes toward orthodoxy and heresy. Chesterton critiques prominent figures of his time, such as Rudyard Kipling and H.G. Wells, as he explores the erosion of philosophical thought and the significance of fundamental beliefs in literature and politics.