This is a book filled with some fantastic ideas! Some of the concepts around the technology, its use and development, are inspired. The principal character is believable and you genuinely begin to care for her. There's a scene late on where a foot chase goes bad and each element of the fight is detailed in a credibly chaotic fashion; not at all a "bang, you're dead" Hollywood fight (where the bad guys couldn't hit the broad side of a barn at 20 paces, and the good guys make every shot count) , but instead, a messy, complex business with bystanders falling and innocents suffering. That said, I get the impression this has been written by more than one person, or at least that the editor has only paid attention to selected parts of the book. There are some pretty unbelievable coincidences which detracted from the story for me. How fortuitous for the narrative, for example, that the children of wealthy industrialists just happen to come along at the right time. How unfortunate that a character's introduction to Earth requires a catastrophic (and HUGELY unlikely)collision to give it an imperative edge. When reading, I don't want to be thinking, "Hang on, why did that happen"... or "Thats handy that a completely alien technology can quickly be understood merely by playing around with it". There are rather too many "fortunate" events that drive the story onward. Some of the writing (only some) is clunky and sits apart from other parts of the book - I got a mental image of the writer getting feedback from others but only making corrections in some parts of the book. Its not a bad read, there are some (really) great ideas and some well-thought-out scenes, but the whole thing has a feel of being unpolished and a little poorly edited. I hope the author has another go and I look forward to seeing another tale from her, hopefully she will have sorted the editing and polished her craft.