Once regarded as a conservative critic of culture, then enlisted by the court theoreticians of Nazism, Nietzsche has come to be revered by postmodern thinkers as one of their founding fathers, a prophet of human liberation who revealed the perspectival character of all knowledge and broke radically with traditional forms of morality and philosophy.

In Nietzsche: The Ethics of an Immoralist, Peter Berkowitz challenges this new orthodoxy, asserting that it produces a one-dimensional picture of Nietzsche's philosophical explorations and passes by much of what is provocative and...