Admiral Chase Williams and his agents pursue a group of terrorists called the Black Order. But the terrorists possess a weapon of mass destruction that they will unleash on millions of innocent civilians.

"In this action-packed thriller in the New York Times bestselling Tom Clancy's Op-Center series, America's elite task force must take down a group of ruthless domestic terrorists determined to paralyze the country through extreme acts of violence. They are known as the Black Order. Self-proclaimed patriots and survivalists, they refuse to surrender their values and beliefs to the left-leaning cultural and progressive forces threatening their nation....