In this new accessible philosophy of friendship, Mark Vernon links the resources of the philosophical tradition with numerous illustrations from modern culture to ask what friendship is, how it relates to sex, work, politics and spirituality. Unusually, he argues that Plato and Nietzsche, as much as Aristotle and Aelred, should be put centre stage. Their penetrating and occasionally tough insights are invaluable if friendship is to be a full, not merely sentimental, way of life for today.