Amazon.com description: Product Description: An intensely dramatic thriller of vengeance, desire, and the unyielding power of justice from the New York Times bestselling author of the Kate Burkholder series. 
 
Assistant D.A. Kate Megason is about to prosecute the case of her career—a senseless double homicide caught on video. But before she can bring it to trial, someone starts sending her terrifying messages. Someone who obviously knows Kate’s deep, dark secret...
 
Eleven years ago, Kate and her seventeen-year-old twin sister were brutalized and left for dead. Kate survived, but her sister was left brain damaged, her life destroyed—and the perpetrators were never caught.
 
Now, Kate needs the help of Frank Matrone—an investigator with his own shadowy secrets—to help her discover whether the maniac she escaped all those years ago is the same madman taunting her now. If she and Frank don’t succeed, Kate’s brutal past will likely be repeated. Only this time, she won’t survive...