This is a five star book, no question... The book itself deals with the human reaction to the discovery of something so incomprehensible as to shake the soul to the core. The plot centres on a typical group of Sci-Fi characters, the scientist, the soldiers, the administrator...... It is in the development of these characters which enriches this complex physics based novel. Speaking of physics, yes the plot does involve spatial geodesical warps, but hey, Bear would have been slagged off if he had have just dropped an infinate trans dimensional tube into the middle of space without at least explaining how it came to be. So, if you like your Science Fiction to give you a head ache and severe insomnia, this is the book for you. However, if you don't want your girlfriend to start sleeping with someone else as she's fed up with being ignored in preferanc of a book, stick to... Asimov.