Gemini by Mike W. Barr is a pretty typical Star Trek novel. Favorite characters off on an important mission. Set during the original five year mission the story is, unfortunately, only mildly interesting. The book does, however, succeed in catching the mood of the series and the characterizations of the main characters is spot on.
When the Enterprise is sent to the planet Nador to facilitate the Nadorians first election things begin to go wrong almost immediately. The Nadorians will be voting on whether or not to join the Federation, and there are those who will stop at nothing to prevent that from happening. Then the planet's monarch's, their Serene Highnesses Abon and Delor, become a target for the opposition, who seem to be able to operate with impunity.
It turns out that Kirk's nephew Peter ("Operation Annihilate!") has been living on the planet. Between assassination attempts on the princes, annoying Nadorian bureaucrats, and the kidnapping of Peter Kirk, you would think it should all be pretty exciting. Regrettably it isn't. Gemini has its moments but many of the scenes that should have been the most stimulating fall flat.
The best part of the story is the interaction between Kirk, Spock and McCoy. The playful byplay and camaraderie shines through the setting. Several lower deck characters play an enjoyable roll too, such as Yeoman Barrows who befriends the princes consort, Lady Pataal. Chekov, Sulu, Uhura are barely utilized but Scotty gets a few moments.
The characters original to the story, however, just don't work very well. The princes, conjoined twin brothers whose well being is a major part of the storyline, failed to capture my interest or sympathy. A crying consort hovering in the background didn't help much either. The local bureaucrats are at least unlikable. Two characters I did enjoy though were the Federation representative, Commissioner Sylvan Roget and his wife Janine.
Those longing for an original series adventure should be satisfied with Gemini but those looking for something more than run of the mill might want to try something else.