In her most masterful novel of medical suspense, New York Times bestselling author Tess Gerritsen creates a villain of unforgettable evil--and the one woman who can catch him before he kills again. He slips into their homes at night and walks silently into bedrooms where women lie sleeping, unaware of the horrors they soon will endure. The precision of the killer's methods suggests he is a deranged man of medicine, propelling the Boston newspapers and the frightened public to name him "The Surgeon."