The Categorical Imperative is supposed to provide a way for us to evaluate moral actions and to make moral judgments. It is not a command to perform specific actions -- it does not say, follow the 10 commandments, or respect your elders.
A blurb on a book can be any combination of quotes from the work, the author, the publisher, reviewers or fans, a summary of the plot, a biography of the author or simply claims about the importance of the work.
A Thriller. Available Feb 2011. You pick up a book because the cover or title looks interesting. The next thing you do is read the back blurb, or if you are online, you read the first excerpt which is usually the same thing. At basics, the back blurb is a sales pitch. It has to be almost an exaggeration of your story that entices the reader to buy, or at least download a sample to their Kindle or iPad.