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Forced to disguise themselves as interstellar traders, Captain Kirk and Mister Spock are trapped on the primitive world of Organia as Klingon Defense Forces occupy the planet. Determined to make the Organians see that they need not bow to oppression, the Starfleet officers sabotage Klingon materiel. In retaliation, the Klingon captain Kor executes many Organians.
The Enterprise is sent back to the site of a previous skirmish with the Klingons for a confrontation with the I.K.S. D'k Tahg. Even as the two ships face each other, trouble is brewing among their crews. On the Enterprise, Lieutenant Leslie Parrish is pregnant with a half-Klingon child and Section Chief Michael Fuller still carries the wounds of the twenty-five-year-old Battle of Donatu V.
(follows Errand of Vengeance trilogy) Tensions between the Federation and the Klingon Empire are the highest they've been since the Battle of Donatu V twenty-five years earlier. Even as Federation Ambassador Robert Fox engages in tense negotiations with the Klingon ambassador to maintain the peace, Captain Kirk sees his vessel refit from a ship of exploration into a ship of war.
In anticipation of a monumental conflict with the Klingon Empire, the Enterprise is assigned to guard a vital starbase located perilously close to Klingon space. But even as Kirk's mission brings him into a tense confrontation with an invading Klingon battle cruiser, an equally deadly menace lurks within the ranks of his own crew: Klingon infiltrator agents.
Lt. Jon Anderson is the newest security officer aboard the U.S.S Enterprise. Starfleet Command fears that the Klingons are gearing up for a major offensive. The Enterprise would be on the front lines of an all-out interstellar war, but Lieutenant Anderson is actually a Klingon infiltrator assigned to sabotage Starfleet from within. His first mission: kill Capt. Kirk.
Sensors detect a massive power source on a planet supposedly populated only by a race of primitive humanoids. Captain Kirk decides to investigate the matter personally, beaming down to the planet with Dr. McCoy and a team of security officers. But Kirk is in more danger than he knows, as among the landing party is Lt. Jon Anderson, a Klingon infiltrator on an undercover mission.
On their way to the Gorn Homeworld the Enterprise stops to investigate a mysterious alien artifact. Captain Picard is suddenly hurled through time and space and the Gorn summit goes terribly wrong.