Being by Kevin Brooks
Robert goes into the hospital for a routine endoscopy and it's discovered that his insides are more machine than human. Some officials in suits try and capture him, but he takes off. What follows is a basic cat and mouse thriller. He finds a girl who makes fake documents and they flee the country (England) together and, of course, fall in love. The questions about what makes one human abound. Robert always thought of himself as human and now he doesn't know what he is. The book ends without resolution and is very unsettling. It's well written but I didn't love it. I'd give it a maybe.