For everyone that has read Zizek and suspected that there is something deep and substantial in his work, that the philosophical propositions at the core of his texts are really worth something, but, at the same time is having difficulty with articulating what these propositions actually are, and synthesizing the meat of the philosophical work from the flurry of spastic tangents, digressions, jokes, and clever asides that make reading Zizek so entertaining, then this is the book for you!
Johnston has certainly done his homework, and it is clear that he has read not only Zizek, but also his sources and interlocutors (Freud and Lacan; Kant, Schelling, Fichte, and Hegel; Badiou and contemporary neuroscience) extensively, and he is thus capable of distilling the essence of Zizek's philosophical work and innovations in a consistent, clear, logical, and ordered argument. In a way (as Zizek himself admits on the back cover), Johnston's argument/summary is easier to follow and more compelling than Zizek's own work. This is definitely a work focused on the philosophical and ontological core of Zizek's thought, and for the most part leaves aside the ideological and political dimension. However, for anyone acquainted with Zizek who is interested in the philosophical and ontological propositions that ground Zizek's work, then this book is a must read.