No one knows the mind of a killer like Emma Kavanagh. 

How do you solve a puzzle when there are no pieces? 

When an attractive, well-dressed woman is found dying on a Chelsea street, it seems clear to DS Thea Walsh that this murder will be one that is wrapped up quickly. 

The policing murder manual describes the golden hour, that window in time in which the most critical information can be gathered and they have the best start. The witness who found her reacted quickly and respected the crime scene. 

And then there is the victim herself. She is wearing a wedding ring and has recently had a child, so someone will be looking for her. She is, to all intents and purposes, the perfect victim. 

Until she isn't. Because what if your perfect victim has no name? 

What if the woman that everyone should be looking for can't be found?