A high-profile killing has brought FBI Special Agent and forensic artist Sydney Fitzpatrick to Amsterdam—even as the assassination of a prominent U.S. senator rocks the political world. Two seemingly unrelated murders are leading Sydney to the threshold of a shocking conspiracy to spread a plague of death across the globe, especially when her sketch of a killer—and possible conspirator—reveals the face of a female CIA agent believed to be dead. The murder of a witness and the disappearance of the missing agent's husband, covert government operative Zachary Griffin, has Sydney racing against the clock to prevent a biological nightmare of astronomical proportions. For the dark hour is rapidly approaching when all secrets will be revealed . . . and the lives of countless millions will hang in the balance.