The Final Reflection

Summary
From the back cover: Klingon Captain Krenn is a ruthless war strategist. But on a mission to Earth, Krenn learns a lesson in peace.

Suddenly he must fight a secret battle of his own. His Empire has a covert plan to shatter the Federation. Only Krenn can prevent a war - at the risk of his own life!

Information

 * In August 1999, this novel was re-printed as book 1 of the World's Apart mini-series along with How Much for Just the Planet?. In 2004 it was reprinted with the TNG novel Kahless as the Signature Edition book The Hand of Kahless.
 * It is stated in the novel, that it is at least ten years after the signing of the Organian Peace Treaty, placing the framing story sometime later than 2277. If the dating relative to the Sentry/Devisor incident is accurate, the framing story is in 2283 or 2284. However, the situations presented in the framing story do not match other events of 2277, 2283, or 2284.
 * Published in 1984, makes use of the timeline, events, and ships of the Star Trek Spaceflight Chronology (see Memory Alpha article) and predates much material developed for later movies and series, which leads to some difficulties in adapting it to the now-canon chronology. For example, the relative ages of Spock and McCoy -- with Spock about eight years older -- stem from the best estimates of the time, but have since been superceded by later canon references.
 * Establishes that in it's 'current year' [see above for that debate], a book was published called The Final Reflection, by an author called John M. Ford, a device used in similar ways in Mudd's Angels, Strangers from the Sky and Star Trek: The Motion Picture.

Canon Story References

 * "Errand of Mercy" (TOS episode)
 * "Day of the Dove" (TOS episode)