The book is primarily a critique of a materialistic view of persons and their experiences. Its subject matter is quite broad, as it includes a consideration of not only whether there can be an adequate materialist treatment of sensations, consciousness, and intentionality of thought, but also of whether there can be such a treatment of perceptual experience, on the one hand, and of self-consciousness, on the other. It presents a case for concluding that the difficulties facing the materialist are overwhelming.