Greg Bear 
Quantico 

The Dome of the Rock in Jerusalem has been blown to bits by extremists, and, in retaliation, thousands have died in another major attack on the United States. Now the FBI has been dispatched to deal with a new menace. A plague targeted to ethnic groups–Jews or Muslims or both–has the potential to wipe out entire populations. But the FBI itself is under political assault. There's a good chance agents William Griffin, Fouad Al-Husam, and Jane Rowland will be part of the last class at Quantico. As the young agents hunt a brilliant homegrown terrorist, they join forces with veteran bio-terror expert Rebecca Rose. But the plot they uncover–and the man they chase–prove to be far more complex than anyone expects.