It is a bit strange. As I understand it, some prostitutes were murdered a long while ago while Claire was a policewoman. She was working with John Hind and they had an affair which resulted in her getting pregnant. She tried to kill herself. She survived but the baby didn't. Very recently another prostitute has been murdered this time by a woman, but I can't work out how she is connected to the story. I am sticking with it but it is difficult to follow as it leaps about all over the place.