After death, the autopsy awaits. And sometimes even before that. An unnamed young woman in forensic medicine - nothing unusual for Maura Isles. But when the pathologist opens the body bag, the seemingly dead woman suddenly opens her eyes. Maura immediately rushes the hypothermic woman to the hospital. Barely arrived, the unknown woman kills a guard and takes patients hostage - including Detective Jane Rizzoli, who is about to give birth. Maura and Jane's husband Gabriel begin to investigate themselves...