Goodbye, Philip Roth

Goodbye, Philip Roth is a strange novella that challenges the reader and won't let up: What is going on? Who is this "Martin Smith" (a fictional character easily confused with the author) who is so obsessed with how America's great author, Philip Roth, is slowly and so very cleverly humiliating him, destroying his career? Is the narrator completely mad, or is there a basis for his paranoia?