Blaze is a book that holds more than one story. That is not to say it is a book of short stories (because it isn’t). Allow me to clarify: one story is the novel itself; another story is how the novel went from draft to published; and there is another, unrelated, story after the novel portion ends. This may sound confusing, but it’s actually quite simple. I’ll explain.
It is good to begin at the beginning. The cover of the book says that Blaze was written by Richard Bachman, and that it contains a Forward by Stephen King. Most, if not all, Stephen King fans know that Bachman and King are actually the same person. King was writing under the pen name Bachman for a while, and eventually got discovered.