The 23rd Midnight by James Patterson & Maxine Paetro

The latest in this "successful and suspenseful" ( Entertainment Weekly ) an attention-seeking copycat is recreating murders by a famous killer from the Women’s Murder Club’s past—with devastating new twists.   Detective Lindsay Boxer put serial killer Evan Burke in jail. 
 
Reporter Cindy Thomas wrote a book that put him on the bestseller list.
 
An obsessed maniac has turned Burke’s true-crime story into a playbook. And is embellishing it with gruesome touches all his own. 
 
Now Lindsay’s tracking an elusive suspect, and the entire Murder Club is facing destruction.