_Titan_ by Ben Bova is the sequel to his earlier novel _Saturn_, part of his Grand Tour series of novels set in the solar system of the late 21st century. It picks up about a year or so after the events of _Saturn_ and it would be helpful if not essential for a reader to have read the earlier novel first.
Much like with _Saturn_, much time is spent on the politics, intrigue, and personal lives of people on the station _Goddard_ though unlike with the novel _Saturn_ the intrigue this time is more closely tied in with the science of the mission. Some might be frustrated by the book's concentration on story elements not directly related to science but they do tie in well with the science and the pace of the book is very brisk.
Essentially, there are four main story elements though other characters do have arcs of their own. Malcolm Eberly, the power-hungry, suave, and manipulative chief administrator, is trying to sow up the next election and is working hard to buy off or counter any potential rivals. Holly Lane, the station's chief of human resources (in addition to contending with romantic issues and a visit by her sister from the colony of Selene, Pancho Lane) is trying to come to grip with issues of the station's future - specifically, whether or not people on the station can start having children. Dr. Edouoard Urbain is obsessed with trying to get his malfunctioning robotic rover on the surface of Titan, named _Titan Alpha_, up and running again after some mysterious complete and total break in communications with the probe occurred after it landed. Finally, Nadia Wunderly, the scientist who made the amazing discovery in _Saturn_ of the apparent existence of life in Saturn's rings, is desperate to try to follow up on her experiments and stop proposals to mine the rings for water.
If you liked _Saturn_, you will like _Titan_, as the pace is similar and nearly all of the characters from the first novel return in the second. As I mentioned, the pace is brisk, the book is quite readable, and this time there is a good bit more science in the novel. It wasn't the best of his Grand Tour series however (_Venus_ and _Jupiter_ were I think the best installments). Some of his characters, even by their own admission, were single-mined to the point of being almost one-dimensional characters (chiefly Dr. Urbain and Eberly), I think some of the writer's views on the differences about men and women when it comes to children was a bit antiquated feeling (but then who really knows what people will think on such matters a hundred years from now), and Holly Lane's slang ("I click," "'Kay," "prob'ly," "nossir", etc) while not constant, was frequent enough to be irritating, particularly since some of the contractions didn't make much sense to me and none of the other characters spoke like that (well, sometimes Pancho did). Bova might have been trying for local color with Holly, maybe going for a youthful sounding individual, I don't know, but it really bothered me sometimes. I am trying to remember if she sounded that way in _Saturn_ or not. In the end though a pretty minor complaint, I don't mention it to drive away potential readers of the book, just something I had to get off of my chest.
Overall I did enjoy the book though and it did have an interesting twist at the end.