Building a whole world, in a far future which is drastically different from the present, is a big challenge, easy to flop. There's so much information to give the reader instantaneously. Newton deftly avoids the common mistake of beginning with a lot of explanation by jumping right into the story, which is a strategy that has its own pitfalls. As the book opened, I wasn't sure it was working (what is a Dyarc? What is Luminum?), but I quickly figured out enough to get through, and got caught up in the story. As I learned the lingo, I wanted to go back and re-read the beginning, to see what I'd missed, which is a good sign.
YA isn't my favorite genre. I think a lot of books are placed in the YA genre so as to avoid delving deeply into the big questions. In this case, Newton does an excellent job of delving. The primary characters are shown in their ordinary lives, then struggling to work through extreme difficulty. The reader gets to see them change and discover themselves, with plenty of depth and emotion, and with each their own distinct voices. The characters in Linked are willing to go into their intense pain, which is a convincing motivation to overcome their various weaknesses. The one exception I noticed to this was in the case of a character who is a habitual drug user, who suddenly has to quit. Apparently he detoxes and gets on with life in a couple days, which seemed entirely unlikely to me. But by that time, I liked him so much, and wanted so badly to know what was going to happen next, that I didn't have trouble ignoring that.
It took me a while to get all the characters straight in my head. There are a lot, and many have names that are unfamiliar. Newton does a pretty good job of managing them all, and tying together a lot of loose ends before the story is complete.
The plot is complex, and much more compelling than I would have expected from the description.
This book is very much in need of a line editor. I've never read a perfect ebook, but this one had enough problems to detract from the reading experience. It's unfortunate, because otherwise, the book is quite good; but the extra commas and dropped words make it seem amateurish.
Even so, I got thoroughly caught up in the story, enough that I didn't want to put it down, and will look forward eagerly to the next book in this series.