Rusty Nail is the 3rd book in the Jack Daniels series by J A Konrath. The books center on Detective Jacqueline "Jack" Daniels. In this installment, Jack is faced with a probably copycat killer. She is sent a video of a murder that follows the same MO as the Gingerbread Man--a serial killer that Jack already caught. Jack is ordered to stay away from the case, but the killer is targeting her personally, and she can't stay away. Before all is resolved, Jack, her partner, and her friends will all become the targets of the sadistic killer.
The book is pretty graphic, and there is plenty of dismemberment, torture, abuse, and murder. So, be prepared. The story is pretty good, though I found some of Jack's reactions and actions unbelievable and the killer was rather predictable.
Not a bad read, but not sensational, either.