Just finished this:
It’s aimed at “young” adults rather than “not grown up yet” adults but it’s pretty good. The story is vaguely reminiscent of “Ender’s Game”, ie the main protagonist is a high achieving misfit who is bullied by his peers.
Being aimed at teenagers, it’s fairly light on the science (although there is a bit in there) and it’s a pretty easy read, I got through it in an few hours today.
I’d say it’d be a great sci-fi starter( gateway drug ) for smartish pre-teen kids, not necessarily just teenagers. I’ve passed it on to Lauren and ordered the next 2 books in the pentalogy.