This is an excellently written, thoroughly enjoyable book. The descriptions are great. The pacing is well judged. There is a lot of character reflection, but almost entirely mixed with the action. The characterisations are incredible. Personally I thought Uhura rather than Zetha was the strongest and most vivid, but all of them were excellent. Uhura and Zetha were on the level of the depiction of Data in Jeffrey Lang's Immortal Coil. This book is also epic in scope: elements from Uhura's century of service in Starfleet, potential war between the Federation and the Romulan Empire, and the key event in the Romulans' past responsible for shaping their entire cultural development. I have two minor faults. One is that Cretak's story is set chronologically before the events in the prologue, but is written so that it seems concurrent with the main story, which confused me a little. The other is that this is about the investigation of a lethal virus, yet there seemed no atmosphere of urgency or tension in the writing. Finally, the book is absolutely full of Star Trek references, from every series and an amazing number of books, but they are all seamlessly woven into the story. There is no feeling that scenes were written just to make such references. In summary, this is a fantastic book, and it is already my provisional favourite for 2004.