Most books published with appended discussion questions have those questions added by a marketing department, not embedded in the text. The better category to look for is books that generate questions by themselves — where the structure, the argument, the moral complexity, or the form forces the reader to keep interrogating what they have read rather than arriving at comfortable conclusions. These are not always the most enjoyable books to read alone, but they are almost always the most valuable to read with others.
Man's Search for Meaning by Viktor Frankl raises the question of meaning as a practical matter rather than a philosophical abstraction: what gives a specific person the will to survive when everything external has been taken? The implicit follow-up question — what gives you the will to continue when nothing catastrophic has happened but ordinary life has become hollow — is the one groups actually spend their time on. Frankl's answer, which involves choosing one's attitude toward suffering, is short enough to summarize and deep enough to argue about at length.
Thinking, Fast and Slow by Daniel Kahneman generates discussion by showing readers how systematically their own minds fail them. The chapter on what Kahneman calls "the experiencing self" versus "the remembering self" — the discovery that our memories of experiences are not accurate records of the experiences themselves — produces the most discussion, because it calls into question how we evaluate the major choices of our lives. Groups where members have made different life choices (different careers, different relationships, different paths after a fork in the road) find this chapter genuinely difficult to absorb.
The Body Keeps the Score by Bessel van der Kolk is about how trauma reshapes the brain and body — and about what that means for treatment, for relationships, and for the way we think about emotional pain as something separate from physical experience. Groups reading this book consistently arrive with different experiences of trauma and different levels of acknowledgment of those experiences, and the book provides a framework for discussing both without requiring anyone to disclose more than they choose to.
Behave by Robert Sapolsky addresses the question of why humans do what they do, working backwards from a human action to the neuroscience, the hormones, the evolutionary history, and finally the cultural context that produced it. The final chapter on free will is the most discussed: Sapolsky argues, carefully and without sensationalism, that the evidence against free will is stronger than most people are prepared to accept. The discussion this generates tends to be about whether his argument is right and about what the implications are if it is.
Between the World and Me by Ta-Nehisi Coates is a letter, which means it is addressed and personal in a way that some books are not. The question it forces on readers — particularly white readers — is not intellectual but ethical: what does it mean to have benefited from a system whose costs were paid by others? That question is not one most people have been asked directly, and Coates's refusal to offer absolution gives the discussion both its difficulty and its substance.
The philosophy shelf is worth considering for groups that want to go further. Beyond Good and Evil by Nietzsche is a sustained provocation — every page raises an argument that demands a counter-argument. The Second Sex by Simone de Beauvoir is one of the founding texts of modern feminism and still generates productive disagreement about which parts of its argument hold and which have been superseded. Neither is easy reading, but both reward the effort with more discussion than most books published specifically for book clubs ever produce.
The quality that makes a book genuinely discussable is the same quality that makes it genuinely literary: irreducibility. A book that can be summarized in a sentence — its argument, its lesson, its moral — leaves nothing for a group to do but agree or disagree with the summary. The books above resist summary. They ask questions they do not fully answer, and the questions are real ones.