Cases of historical and contemporary social movements suggest that among activists, reading texts together is a valuable learning experience. However, less research exists on the specific texts youth activists seek out in their work and the role these texts play in shaping their understanding of themselves as activists. Drawing on Rudine Sims Bishop’s classic formulation of books as mirrors, windows, and sliding glass doors, this study explores the under-appreciated role texts may play in drawing young people to activism and shaping their identities as activists. Coupled with interview data from six youth activists engaged in the climate justice movement, survey data from 237 self-identifying youth activists suggest that the texts youth activists name as influential serve a “through the looking glass” function: they often reflect problematic aspects of the social world and one’s place within it, while also revealing new and aspirational roles readers might take on to address social problems. The texts the youth identified as influential were diverse; there were few commonalities among titles, underscoring the importance of ongoing access to a broad range of reading materials. Ultimately, findings suggest that texts work to bind together the various internal and external, micro, meso, and macro influences that collectively shape youth activists’ narratives of becoming.