This work investigates the nature of human evil and the philosophical frameworks required to understand why individuals commit harmful acts. Mary Midgley, a prominent moral philosopher, challenges the notion that evil is merely a product of external circumstances or psychological pathology. She argues that human wickedness is a complex phenomenon rooted in our biological nature and social structures, requiring a nuanced ethical approach rather than simplistic moral condemnation. By examining the interplay between human instinct and societal influence, she provides a rigorous analysis of how moral responsibility functions in a flawed world.

Experts frequently cite this work as a foundational text for understanding the intersection of biology and ethics. Readers often note the clarity of Midgley's prose, which makes complex moral arguments accessible to both students and general readers.