If this book had halted after its opening chapter, an adjective like “elegant” would fit the resulting essay well. Those opening pages sketch with precision “the classic social movement agenda” developed since the 1960s, respectfully yet sharply identify important limitations of that agenda, and suggest some plausible theoretical tools for moving beyond those limits. Having themselves over those decades made so many contributions to the study of movements and related phenomena (the bibliography cites a half-dozen of their own previous books and could easily have contained more), the intrepid trio are now marking out some very interesting new trails.