In "Redemption Ark" Alastair Reynolds continues his story of the impending threat to human space faring society we learn about in "Revelation Space". As the other reviewers have pointed out, this book is clearly meant to be part of a series, although I don't think it is crucial to the understanding and enjoyment of the story to have read the prequels (or in fact prequel, since "Chasm City" is more of an independent story, set in the same fictional universe). It is however obviously meant to be a stepping stone leading up to the final decisive struggle against the Inhibitors, of which we should be able to read about in early 2004 or hopefully late next year. By then you will have had plenty of time to catch up on the preceding events should you wish to, which I very much recommend since they are all hugely enjoyable and interesting. Reynolds is an astrophysicist working for the ESA in the Netherlands, and his intimate knowledge of the subject shows in his work. It's this understanding of space and possible future technologies that distinguishes him from many of his contemporaries and adds the plausible scientific backdrop to his action packed stories, giving them that sense of reality that makes them so fantastic. For anyone who's interested in Hard SF (science fiction grounded on science fact), or would like to make an excursion into this branch of SF, you can't go wrong with Alastair Reynolds, although you might as well begin with "Revelation Space" and then work your way through, or you might not forgive him the long wait to see what happens next...