Star Trek VI: The Undiscovered Country movie

An accident on the Klingon moon Praxis forces the reluctant Klingon Empire into a peace treaty with the Federation. Kirk, despite his mistrust of the Klingons after they murdered his son at Genesis, is forced to escort a Klingon cruiser carrying the Klingon Chancellor to Earth for the meetings. During the voyage the Klingon cruiser is attacked, and Kirk & McCoy are taken prisoner after the Chancellor is murdered by two Starfleet crewmen. Spock immediately begins an investigation, while Kirk & McCoy are sentenced to life on Rura Penthe - a deep-frozen asteroid. Spock, meanwhile, has discovered that a Klingon Bird of Prey - one that can fire when cloaked, and under the command of Kingon General Chang - is the ship responsible for firing on the Chancellor, and the 2 assassins came from the Enterprise. A rescue of Kirk & McCoy is successful, after which they discover a conspiracy among Starfleet, Klingon, and Romulan officials whose plan is to incite a full-blown war! The Enterprise & Excelsior - under the command of Hikaru Sulu - head for a deadly rendezvous with General Chang at the peace summit to prevent war from breaking out...but will they be too late?