Val McDermid 
Killing The Shadows 

A killer is on the loose, blurring the line between fact and fiction. His prey are the writers of crime novels who have turned psychological profilers into the heroes of the nineties. But this killer is like no other. His bloodlust shatters all the conventional wisdom surrounding the motives and mechanics of how serial killers operate. And for one woman, the desperate hunt to uncover his identity becomes a matter of life and death.