"Framed in debates about the crisis of democracy, the book analyses one of the most influential social movements of recent times: Spain's "Indignados" or "15-M" movement. In the wake of the global financial crisis and harsh austerity policies, 15-M movement activists occupied public squares across the country, mobilized millions of Spanish citizens, gave rise to new hybrid parties such as Podemos, and inspired pro-democracy movements around the world. Based on access to key participants in the 15-M movement and Podemos and extensive participant observation, the book tells the story of this remarkable movement, its emergence, evolution, and impact. In so doing, it challenges some of the core arguments in social movement scholarship about the factors likely to lead to movement success. Instead the book argues that movements organized around autonomous network logics can build and sustain strong movements in the absence of formal organizations, strong professionalized leadership, and the ability to attract external resources. The key to understanding its power lies in the shared political culture and collective identity that emerged following the occupation of Spain's central squares. These protest camps sustained the movement by forging reciprocal ties of solidarity between diverse actors, and generating a shared set of critical master frames across a diverse set of actors and issues (e.g. housing, education, pensions, privatization of public services, corruption) that enabled the movement to effectively contest hegemonic narratives about the crisis, austerity and democracy, influencing public debate and the political agenda"--