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.
Familiar types of plot devices include the deus ex machina, the MacGuffin, the red herring, and Chekhov's gun. Plot outline. A plot outline is a prose telling of a story which can be turned into a screenplay. Sometimes it is called a one page because of its length.