Postmortem for a Postmodernist

Ettore Gnocchi, the famed postmodern theorist, has been murdered at his own dinner party. To find out who killed Gnocchi, the detective Solomon Hunter must first explore postmodernism itself. What is it? Who are Baudrillard, Foucault, and Habermas, and what do they think? Why does any of this matter, anyway?