Lady of the shades - Darren Shan

Ed, an American author on the hunt for a story for his next book, arrives in London looking for inspiration. A stranger in a strange city, he's haunted by a deadly secret that refuses to stay buried, and no matter how hard he tries he cannot escape the manifest sins of his past.
What Ed wants is answers, what he finds is something he definitely didn't bargain for: the beautiful and untouchable Andeanna Menderes. Andeanna is a woman who is dangerously bound to one of London's most notorious crime lords, and if they are caught together it could mean death for them both.
Ensnared in an illicit affair that can only be conducted in the shadows, Ed's world is turned upside down as a series of shattering revelations blurs the line between what's real and what's not...