Star Trek: New Frontier, book 03 : The Two-Front War
Peter David1997

Dr. Selar: The Excalibur's Vulcan doctor is all business. If you want to know what's wrong with you, she's the one to go to, but not if you're expecting someone to hold your hand. As clam and logical as the rest of her people, Dr. Selar has a secret as shocking to her as it will be to the rest of the crew.
Si Cwan: A prince exiled from the Thallonian empire, he is beloved by some and targeted for death by others. But Si Cwan has his own agenda: a search for the one woman who means the world to him.
Zak Kebron: The bronze-skinned Brikar is the security chief of the Excalibur. When he walks, the decks shake, and if he's coming your way, you'd better pray that you're on his good side.

Two mysteries vie for the attention of the crew of the Excalibur. Is the hospitality of the people of Nelkar too good to be true? And does a stranded spaceship truly hold the object of Si Cwan's quest...or is it instead an all-too-deadly trap?