Evolutionary theory holds a vital key to understanding ourselves and is at the centre of modern biology. Yet, as Henry Plotkin shows in this brilliantly argued account, it has never been integrated into psychology, the very science that seeks to explain the processes of the mind. He explores why this is, tracing the development of evolutionary theory from the discoveries of Darwin to the most recent debates on the structure of the mind. Psychology, he asserts, needs the theory of evolution just as much as it needs an understanding of how the brain works. In proposing a more revolutionary approach to psychology Professor Plotkin vividly demonstrates how an evolutionary perspective brings us closer to understanding what it is to be human and how we came to be so.