Tricia Sullivan 
Someone To Watch Over Me [EPUB ebook] 

When Sabina picks up Adrien battered and bleeding outside Zagreb station, she knows only that she is drawn to this stranger and to the sense of danger he represents. She has no idea that she is also touching the Watcher, a mysterious figure who can inhabit Adrien’s body using a brain implant.What might have been a love affair is about to turn deadly, for as Sabina is drawn into Adrien’s world, she will become the object of the Watcher’s desire in a battle over a metamorphic new technology known as I.