Emory Hospital, Atlanta. What should be a routine admission for a run-of-the-mill surgery goes horribly, tragically wrong, leaving a trail of destruction in its wake. The area goes into lockdown--for Emory is not only a major hospital but also a stone's throw away from the Center for Disease Control, the FBI counter-terrorism HQ, and a large children's hospital. Anything that happens there has city-wide--and potentially nationwide--repercussions. A few miles away in a wealthy enclave, medical examiner Sara Linton is trying to get through an awkward family lunch with her mother, her aunt, and her boyfriend Will Trent, an agent with the Georgia Bureau of Investigation. But the serenity of the summer day is broken by the wail of sirens.