Novelist Jonathan Lethem joins us again. This time, he takls about a book callled "The Exegesis of Philip K. Dick." Lethem co-edited it with Pamela Jackson. It's a 900-page doorstop based on the bizare collection of thousands of pages of typed and handwritten notes, journal entries, letters, and story sketches that Dick obsessed over during the last eight years of his life. He was trying to come to terms with a series of strange visionary experiences.