John Scalzi’s series The Interdependency is a space opera trilogy based around ‘The Flow' – stable wormholes that have allowed humanity to establish a galactic empire through faster than light travel.
And thanks to the leader of the Interdependency, The Emperox – an inherited title whose role is now largely ceremonial – it was a relatively peaceful civilization. But when it looks like The Flow isn’t as stable as it seems, things inevitably start to unravel.
Old Man's War is a six novel military science fiction series (with associated novellas). It’s centred around the idea that, upon hitting age seventy-five, you're shipped off-planet and retrained in the military. Then your consciousness is transplanted into a new body, genetically modified for combat. And you’re told to kill a whole lot of weird aliens for various reasons.
The Lock In universe
Head on is the second book set in John’s Lock In universe, following Lock In. Lock In refers to Haden’s Syndrome, a highly contagious virus that spreads across the globe. It leaves an unlucky minority of people fully conscious, but unable to use their bodies – so locked in.
Luckily, Hadens (the name given to those suffering from this) can navigate the Neuronet and pilot Threeps, robotic-humanoid bodies, in order to keep interacting with the world.