The scope of Hagger's book is immense. Universalism is a call to a philosopher to abandon the specialisms (in particular logic and language) and to attempt, once again, the kind of Grand Unified Theory of Everything that has marked the discipline from the beginning. Universalism has the potentiality to be as potent a movement in the 21st century as Existentialism was in the post-war world. Christopher Macann, Lecturer in philosophy at the University of Bordeaux, author of Being and Becoming