Clarissa Rile Hayward's book begins with the provocative claim that focusing on the relationship between the powerful and the powerless is not the best way to study power. Traditional theories of power have concentrated on the question of what it means for A to have power over B. By seeking to discern who possesses it and how their possession diminishes the freedom of others, researchers have tended to put a face on power. In contrast, Hayward “de-faces” power by arguing that it need not entail a relationship between A's and B's but can be understood entirely in terms of how the field of action of both the powerful and the powerless is defined.