The nameless and beautiful woman appears to be just another corpse in the morgue. But when medical examiner Maura Isles unzips the body bag, she gets the fright of her life. The corpse opens its' eyes.
Now very much alive, the "dead" woman is rushed to the hospital where, with cool precision, she murders a security guard and seizes hostages. One of these hostages is a very pregnant patient: Jane Rizzoli.
Who is this mysterious hostage-taker, and what does she want? Only Jane, trapped with the armed madwoman, holds the key to the mystery. And only she can solve it - if she survives the night.