But there was another book Stephanie Meyer wrote, The Host.

The Host was about, simply, aliens. Unlike the vampires in Twilight, they actually did stuff. These aliens were called Souls, and were beautiful, snake-like creatures that supposedly looked something like this:

(art is not mine, picture found here)
Souls had to have a host body to live, and were inserted through the back of the neck into the brain. They were incredibly peaceful creatures, and did not condone violence in any way, and actually bettered the worlds they infested. In the book, they had taken over Earth. When they take over a host body, the "owner" of the body is completely erased, leaving only the Soul to control it.
The book centers around a Soul who had a new, human host named Melanie. The one problem was, Melanie had not been erased. She was still there.
Who else has read this book?