Good Introduction to Zizek

I just want to recommend a good short Introduction to Slavoj Zizek's thinking about Christianity: Frederiek Depoortere's book Christ in Postmodern Philosophy which treats Gianni Vattimo, René Girard and Zizek. I have only read to part on Zizek but it was extremely helpful, giving a good simple introduction to Lacan and a very acessible treatment of Zizek's Christology. Highly recommeded.