JAMES ROLLINS

Sigma Force is a techno-thriller series that chronicles the high-stakes exploits of a covert special operations team recruited by the Defense Advanced Research Projects Agency (DARPA). Selected for their exceptional intelligence and combat skills, the elite unit is deployed on dangerous missions to investigate and secure groundbreaking technological and historical discoveries that threaten the United States—and the world.

Sigma Force is a techno-thriller series that chronicles the high-stakes exploits of a covert special operations team recruited by the Defense Advanced Research Projects Agency (DARPA). Selected for their exceptional intelligence and combat skills, the elite unit is deployed on dangerous missions to investigate and secure groundbreaking technological and historical discoveries that threaten the United States—and the world.