The philosophy of mind is academic territory with a lot of technical literature and a relatively small number of books that are accessible to general readers without sacrificing rigor. The question at the center of the field — what is consciousness, and how does it arise from physical matter — remains genuinely unsolved, which means that the best books on the subject are honest about the uncertainty rather than proposing premature answers. The ones below are worth reading because they engage with the problem seriously and because the engagement produces something valuable even if it doesn't produce a solution.
There is no more sustained popular engagement with the problem of consciousness than Gödel, Escher, Bach: An Eternal Golden Braid by Douglas Hofstadter. Hofstadter's central argument is that consciousness arises from strange loops — self-referential structures in which a system, by representing itself, generates something that cannot be reduced to its components. He builds toward this argument through Gödel's incompleteness theorems (formal systems that generate truths about themselves that they cannot prove), Bach's canons (musical structures that fold back on themselves), and Escher's paradoxical drawings (visual structures that violate their own rules). The argument is not a proof; it is an accumulation of evidence from different domains that the same phenomenon — self-reference generating something irreducible — appears wherever cognition appears. The book is long and requires patience, but it is the most intellectually serious popular treatment of the hard problem of consciousness available.
Kahneman's Thinking, Fast and Slow approaches the mind not as a problem to be solved philosophically but as an object to be studied empirically. System 1 and System 2 are not Kahneman's invention — they are a pedagogical simplification of decades of behavioral research — but his synthesis is the most useful available account of how human cognition actually operates rather than how we imagine it does. The philosophical implications are considerable: if most of our apparent reasoning is post-hoc rationalization of intuitive responses generated by System 1, then the traditional picture of the rational deliberating agent is significantly wrong. Kahneman doesn't push these implications as far as a philosopher would, but the evidence he presents makes certain philosophical positions about mind and agency much harder to maintain.
Oliver Sacks's The Man Who Mistook His Wife for a Hat is philosophy of mind conducted through clinical case studies. Sacks's patients had neurological conditions that disrupted specific cognitive functions in ways that reveal the normally invisible architecture of ordinary cognition. The patient who could not recognize faces assembled them from parts rather than wholes — revealing that face recognition is a dedicated module, not a special case of general perception. The patient with severe amnesia could learn new motor skills while remaining unable to form new memories — revealing that procedural and declarative memory are dissociable systems. Each case is a natural experiment in what happens to selfhood and identity when a component of the cognitive system is removed or altered. Sacks was scrupulous about treating his patients as people, not as illustrations of deficits, and that moral seriousness makes the philosophical point more forcefully than an argument would.
Dawkins's The Selfish Gene is relevant here because it provides the evolutionary framework without which the question "what is mind?" cannot be properly posed. If cognitive capacities evolved because they increased reproductive fitness in specific ancestral environments, then many features of mind that seem puzzling from a design perspective — the unreliability of memory, the tendency toward superstition, the difficulty of reasoning probabilistically — become explicable as solutions to problems that no longer exist. The gene's-eye view also poses the question of whether the conscious, deliberating self is doing any of the work it believes it is doing, or whether it is mostly a narrative generated after the fact by cognitive systems that were selected for purposes that have little to do with truth-seeking. That question has not been answered.
Marcus Aurelius's Meditations is not a philosophy of mind text, but it is the most direct attempt in the Western tradition to use philosophy as a technology for modifying the mind's habitual responses. Aurelius's practice is not theoretical — he is not asking what mind is but what to do with his. The daily discipline of returning to the same Stoic principles, the repeated reminders about what is within his control and what is not, the practice of treating his own reactions as objects of observation rather than facts about the world — these are techniques for reshaping cognitive habit. They map, with reasonable precision, onto what contemporary cognitive neuroscience calls executive function: the capacity to observe and redirect automatic responses. That a Roman emperor was practicing something structurally similar to what Kahneman's System 2 describes, without the vocabulary, is itself a philosophically interesting fact about the stability of certain cognitive architecture across time.
The honest answer to the question "what is mind?" is that nobody knows. These books are worth reading not because they answer the question but because they make the question more precise and the uncertainty more legible. That is as much as philosophy of mind can honestly offer right now, and it is more than most other reading gives you.