Other reviewers cover the plot ponts, so just some comments: as is often the case with sci-fi, the author projects from current technology, posits various interesting consequences, and the book is entertaining in this regard. Lots of nice interconnections with systems and mathematical evaluations of information complexity. Some points of character development are a bit hard to accept, the protagonist, Caitlin, is a math prodigy, but blind since birth, gets much of her experience of the world auditorially, but at 16 years of age we hear her complain to herself over and over again about her undemonstrative father who almost never shows affection in word or by hugs, and oh, the surprise, half way through the book, Caitlin realizes that when her mother told her that Caitlin's dad, a PhD physicist, is "artistic" her mother really said "autistic". ?? The interior monologue of both Caitlin and the developing intelligence that she contacts have a discordant ring to my ear and detracted from the story. Without the lengthy development of unresolved plot threads that clearly presage the follow-on books of the trilogy, the book is a bit thin. Thus an entertaining, but quick, read.