There are 3 books in the The Nexus Trilogy series. The newest book is Apex which came out in 2015.

1
Nexus

Book cover of Nexus
In the near future, the experimental nano-drug Nexus can link human together, mind to mind. There are some who want to improve it. There are some who want to eradicate it. And there are others who just want to exploit it.When a young scientist is caught improving Nexus, he's thrust…
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2
Crux

Book cover of Crux
Six months have passed since the release of Nexus 5. The world is a different, more dangerous place.

In the USA, the freedom fighters of the Post-Human Liberation Front use Nexus to turn men and women into human time bombs aimed at the President and his allies.

The first blows…

3
Apex

Book cover of Apex
They call them the Apex - humanity's replacement. They're smarter, faster, better. And infinitely more dangerous. Global unrest spreads as mass protests advance throughout the US and China, Nexus-upgraded riot police battle against upgraded protestors, and a once-dead scientist plans to take over the planet's electronic systems. The world has…