In this introduction, we discuss the scope of the edited volume by outlining the position of Mostar within much broader academic debates on 'ethnically divided cities'. We question the representations of such contested cities as hopeless spaces of division, and suggest to explore instead the cracks that challenge overpowering logics of partition: the self-directed attempts at inter-ethnic solidarity, grassroots movements for social justice and dignity, and the inconsistent ways people in these cities inhabit and perform ethnic identities. We also introduce the themes of this Special Issue; Divided Cities as Complex Cities; Memories, Affect and Everyday Life; and Grassroots Politics.