Neo-Kantianism was an important movement in German philosophy of the late 19th century: Frederick Beiser traces its development back to the late 18th century, and explains its rise as a response to three major developments in German culture: the collapse of speculative idealism; the materialism controversy; and the identity crisis of philosophy. Frederick Beiser's book is a valuable contribution to the revival of neo-Kantian studies characterizing the past few years: a trend that is blowing the dust off this important, yet hitherto neglected chapter of the history of philosophy. The quality of Beiser's writing is excellent throughout, showing mastery of an impressive range of sources and treating with equal competence a variety of topics in epistemology, metaphysics, ethics, and philosophy of religion.