'Protean Power is the most important statement on power in international relations in over a decade. Ambitious, creative, and analytical, it sets out a new agenda for imagining how power operates in world politics. The authors make a compelling case that power can be divided between protean and control. Control power dominates much thinking in international relations, with the presumption that one actor forces another to do something against its will. Protean power highlights the improvisational and creative responses to conditions of uncertainty. This distinction directs attention to the uncertainties and social capacities that provide a stage for actors to creatively engage the world and in ways that have the unintended effects of transforming it; the possibility of agency for even the weakest actors; the imperative to distinguish more fully between 'power to' and 'power over'; how, when, and why control power is sandwiched by protean power; and how protean power itself can scramble existing social relations and usurp control power. A masterful volume that not only hits the 'reset' on discussions of power in international relations theory, but also helps us understand the bewildering and unanticipated changes that have occurred over the last half-century.' Michael Barnett, George Washington University, Washington DC