'Netwalkers is an excellent series, and book 3 is no exception. This used to be UpLink, a book 2 sequel to GroundTies, but the series has been revamped from the ground up and this is book 3 in a six-book arc (confusingly book 1 is being sold in two parts due to length and to put a beginning at a better price-point).
Nexus starts just a few days after WildCards ends. Admiral Cantrell, representing the ComNet Alliance government is still trying to negotiate with HuteNamid's planetary government so that the 'Net discrepancies she and the spaceship Cetacean were sent to investigate don't escalate into further violence, the type of violence that has wiped out entire planetary colonies. Stephen Ridenour, recovering from injuries ship-side, is nominally sidelined from the investigation, but with a hidden past unraveling, full of secrets kept behind deep security walls, and a mind that will not stop asking, he won't stay out long. Unfortunately a change-agent is ready to put a spanner in the works. Nayati, a passionate young man with access to alien technology is ready for negotiations to be over and rebellion to begin, and he has keys to a power that the ComNet Alliance has no idea exists.
The 'Netwalkers series is character driven, and if you've read this far you care about the characters. Stephen, with no certainty of a future, a wounded past, and full of the secret of at least why one planetary colony was destroyed, a secret he has been forced to not-remember through conditioning on two fronts, conditioning in conflict with each other and on the point of break-down, conditioning he will use any tools on-hand, even those that hurt him, to break through. Wesley is playing his own shell-game of principals and trying to navigate his own way through a mine-field of secrets, some of which are his own. Cantrel, whose integrity pushes her to work toward a future she both hopes and fears for, is up against something she's never encountered before, and having to balance people she has come to care for against the security of society as a whole, a security she is sworn to protect.
The prose is lyrical and the dialog snappy. The pace is lively with both introspective and physical action. There is no saggy middle in these books. This book depends on the one that came before and leads directly to the one after. I would not recommend reading this as a stand-alone novel. The story is fun, with moments of adventure and whimsy, but you would be confused as to why people were doing the things they are doing. For a review of the series so far as a whole, see my review of WildCards - 'Netwalkers II. Try a sample. Get hooked. Become a fan.