Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Rules of Engagement is a Star Trek: The Original Series novel written by Peter Morwood. Captain Kirk is sent to assist in the evacuation of Federation personnel from the crisis-wracked planet of Dekkanar. He is ordered to only participate in the evacuation, not to even raise shields or fire weapons. The situation becomes complicated when Captain Kasak takes an experimental Klingon warship to the planet as well The novel also offers an alternate explanation, via Kasak''s viewpoint, why Klingon''s facial features have changed over the years.