The Incel Mindset: Entering and Exiting Inceldom delivers the first comprehensive, qualitative analysis of incel communities, addressing a fast-evolving and under-researched area at the intersection of gender, technology, and radicalisation. Drawing on extensive interviews with former incels and systematic analysis of online forums, David S. Smith examines how structural inequalities, hegemonic masculinity, and digital cultures shape men's experiences of romantic exclusion. The book situates inceldom within the broader manosphere, interrogating the appeal of red and black pill ideologies, the role of dating apps and algorithmic cultures, and the psychosocial dynamics that sustain these communities. Through detailed case studies and theoretical synthesis, Smith explores how incel spaces provide belonging while reinforcing fatalistic worldviews--and, in some cases, pathways to violence. Crucially, the book identifies mechanisms of disengagement and identity reconstruction, offering insights for prevention and intervention. Combining conceptual depth with empirical richness, The Incel Mindset is essential for scholars and advanced students in gender studies, psychology, sociology, criminology, and digital culture, as well as practitioners addressing online extremism and male mental health.