The Perishing Game — Don Pendleton

THE STONY MAN DOCTRINE
In a world struggling for peace, Stony Man commands a covert vigil against the madmen and murderers harnessing terrorism for personal gain. Now the enemy is an evil just this side of hell....

CONTAGION
A mysterious virus has annihilated two towns, fueling dread that these were test sites for the most
insidious form of terrorism. The killer virus, dubbed White Death, is genetically engineered and racially selective.

The Stony Man commandos must halt the biochemical warfare in a double jeopardy mission -- death at the hands of terrorists, or a lethal contamination. And when the mutant virus turns into an equal-opportunity destroyer, capable of killing diverse populations, the Stony Man teams are the only thing standing between a megalomaniac and mass extinction.