Doppelgangers is the theme running through this story. If you think the idea is far-fetched then do not read this. It is an intriguing book with plenty of thrills and spills. Kate has a special skill called super-recogniser. She has the ability to pick out criminal faces from crowds. After a serious car accident, she has left the force, and moved in with Rob who she met at the hospital. Does he have a mental doppelganger?