Cynthia Miller-Idriss’s latest book addresses a persistent but underexplored issue in counterterrorism and peacebuilding efforts: the role of misogyny as a mobilizing force in violent extremism. Man Up builds on existing literature by clearly connecting gendered grievance to broader patterns of radicalization and political violence. Through case studies and emerging empirical research, the author demonstrates how hostile sexism and normalized misogynistic attitudes are not only social problems but also risk factors for violence. The book outlines five strategies that reinforce gender-based harm: containment, punishment, exploitation, erasure, and enabling. These mechanisms illustrate how gendered ideologies function to mobilize individuals and groups to violence, particularly in online spaces. Miller-Idriss urges practitioners to see these dynamics not as peripheral but as central to understanding pathways toward hate-fuelled violence. For peace and conflict researchers, the book contributes to the literature on structural violence and prevention. It challenges traditional models of threat assessment by pointing out the absence of gender in many government classification schemes and analytical frameworks. ‘It is hard to see a problem for which there is no category’, the author observes (p. 11). Miller-Idriss's solution is to directly confront this ‘blind spot’, which she deems a significant problem for practitioners, analysts, and policymakers (p. 37) In the conclusion, she points to evidence-based resources for educators and caregivers to address misogyny. Along with the book, the author also released the five-episode Man Up Podcast delving into the themes from the book with insights from experts and youth. In sum, this book makes a compelling case for treating misogyny as a security concern and offers a useful framework for integrating gender into violence prevention efforts.