I know a secret / Tess Gerritsen.

I have a secret. And someone wants to make sure I never tell. In a house decorated with horror movie posters, a young woman's body is found. She lies on her bed, two bloodied objects clutched in her palm. Detective Jane Rizzoli and Forensic Pathologist Maura Isles are called to the murder scene, but even faced with this gruesome sight they are unable to identify the immediate cause of death. Their investigation leads them to a high-profile murder case that was seemingly solved years before. But when another body is found in horrific circumstances, the link between the two bodies is clear. Was the wrong person sent to prison? Is the real killer out there right now, picking off new targets? One woman knows the killer is coming for her next. She's the only one who can help Rizzoli and Isles catch him. But she has a secret that she has to keep.