"We know that it matters crucially to be able to say who we are, why we are here, and where we are going," Peter Brooks writes in Enigmas of Identity. Many of us are also uncomfortably aware that we cannot provide a convincing account of our identity to others or even ourselves. Despite or because of that failure, we keep searching for identity, making it up, trying to authenticate it, and inventing excuses for our unpersuasive stories about it. This wide-ranging book draws on literature, law, and psychoanalysis to examine important aspects of the emergence of identity as a...