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.
4. Don't confuse a short book blurb with a short synopsis! This is very important. The big difference is this: A synopsis is a summary of the whole story-beginning, middle and end. It tells the reader (usually an editor) what happens throughout the story-including what happens at the end and how everything is resolved.