Tie-in with Star Trek II: The Wrath of Khan. Short-story biographies of the Enterprise crew, told in the form of letters and other communications. Notable as one of the first licensed releases to establish Uhura's first name as Nyota (something that wouldn't be confirmed on-screen until the 2009 Star Trek film).
A slight correction to my Notes. I just learned that this wasn't one of the first books to establish Uhura's first name - it actually was the book that established it. Not bad for an obscure tie-in release.