Under the Knife - Tess Gerritsen

For David Ransom, it begins as an open-and-shut case. Malpractice. As lawyer for a grieving family, he's determined to prosecute a negligent doctor. Then Dr Kate Chesne storms into his office, daring him to see out the truth - that she's been framed. First it was Kate's career that was in jeopardy. Then, when another body is discovered, David begins to believe her. Suddenly its much more. Somewhere in the Honolulu hospital, a killer walks freely among patients and staff. And now David finds himself asking the same questions Kate is desperate to have answered.