When a rash of mystifying and ghastly deaths, in widely dispersed American cities, captures the attention of the United States government, administration officials recognize that the loss of life may reflect a deeper threat to the whole of the country. The CIA defers to the military to conduct an investigation. The U.S. Army assigns the task to Captain Trey Fitzjames. Fitzjames must study the causes of the deaths and, given the scope of the crisis, eliminate that cause at the source.