Disgraced detective Sam Boulder, FBI counter-terrorism specialist Christopher Poe and CIA analyst Deirdre Drake are drawn to Yale University to investigate the disappearances of several students - including the sons of both the secretary of the army and the newest Supreme Court Justice. All suspect terrorism, but the trail they are following is like no other. An unseen enemy is playing by no known rules, making no demands, somehow anticipating every FBI move - and sending students, one by one, to their death.