In today's success-obsessed world, many lonely people feel like failures. "Never kissed, never touched, never hugged, never held hands, no friends, virgin" — this is how regulars of incel forums, communities of men desperate to find a partner, describe themselves. Thousands of incels bitterly mock society, oscillate between trying to improve their appearance and accepting what they see as eternal celibacy, and debate who they hate more: women or themselves. And some decide to take revenge — and take up arms. In "Incels," practicing Swedish psychiatrist Stefan Krakowski opens the door to this world. He interviews incels, analyzes the crisis of masculinity, and explores links between radical loners and far-right movements to answer important questions: how do people become incels? How dangerous are they? And what can we do to ease their burden before it’s too late?