Robin Cook, author of the New York Times best-seller Seizure, returns with a truly frightening medical thriller. Recently, patients have been dying under mysterious circumstances while undergoing commonplace surgical procedures. Dr. Laurie Montgomery and Dr. Jack Stapleton begin an investigation into the string of unusual deaths. Soon, they are neck deep in a shocking conspiracy. "The best-selling physician/author is in top form...in this gripping medical chiller" –Publishers Weekly starred review