Stargazer Three

Twin sisters Gerda and Idun Asmund, raised as Klingon warriors and serving side by side as the Stargazer's helm officer and navigator, have never needed anyone else, until a transporter accident pulls aboard a woman from a parallel universe who could pass for either of them. As Captain Picard tries to send their visitor home through hostile territory, Gerda's suspicion of the newcomer curdles into something she can't quite separate from jealousy. A Stargazer novel.