Killing the Shadows — Val McDermid

A CUNNING KILLER
A killer is on the loose, blurring the line between fact and fiction. His prey--writers of bestselling crime novels--are unaware that they have scripted their own murders, for this diabolical killer reenacts the most chilling scenes in his victims' books. The desperate hunt to uncover his identity becomes a matter of life and death for one woman...

WITH A THIRST FOR CRIME NOVELS...
Professor Fiona Cameron is an academic psychologist who uses computer technology to help police forces track serial offenders. Fiona is working a case in Spain when her lover, thriller writer Kit Martin, tells her a fellow crime novelist has been killed. It's not her case, but Fiona can't help taking an interest. And it isn't long before the killer strikes again. And again...

AND COPYCAT MURDERS...
Now Fiona finds herself caught in a race against time, culminating in a tense confrontation between hunter and hunted, a confrontation that can have only one outcome...