This book is an introduction to the philosophy of Arthur Schopenhauer, written in a lively, personal style. Hannan emphasizes the peculiar inconsistencies and tensions in Schopenhauer's thought - he was torn between idealism and realism, and between denial and affirmation of the individual will. In addition to providing a useful summary of Schopenhauer's main ideas, Hannan connects Schopenhauer's thought with ongoing debates in philosophy. According to Hannan, Schopenhauer was struggling half-consciously to break altogether with Kant and transcendental idealism; the anti-Kantian features of Schopenhauer's thought possess the most lasting value. Hannan defends panpsychist metaphysics of will, comparing it with contemporary views according to which causal power is metaphysically basic. Hannan also defends Schopenhauer's ethics of compassion against Kant's ethics of pure reason, and offers friendly amendments to Schopenhauer's theories of art, music, and salvation. She also illuminates the deep connection between Schopenhauer and the early Wittgenstein, as well as Schopenhauer's influence on existentialism and psychoanalytic thought.