You may not realize that
Twilight author
Stephenie Meyer wrote another novel that sounds far crazier than her sparkly vampire series, but
The Host is exactly that novel. The 2008 tale seems like a riff on Heinlein's
The Puppet Masters (and several other stories) as it describes altruistic alien parasites called Souls (seriously) that attach themselves to host bodies - in this case humans - and then make their society all ...