"Mediagenic, high-profile gastrointestinal doctor Robynne Chutkan distills the cutting-edge research on the microbiome into a radical and practical new program to restore our overall health"-- Provided by publisher. "Troy Pearce and his team of drone experts are called to action when ISIS launches a series of attacks on U.S. soil. On the eve of President Lane's historic Asian Security Summit, a hobby-store quadcopter lands on the White House lawn carrying a package and an ominous threat: Fly the enclosed black flag of ISIS over the White House by noon today or suffer the consequences. The threat further promises that every day the flag isn't flown a new attack will be launched, each deadlier than the first. President Lane refuses to comply with the outrageous demand, but the first drone attacks, sending a shudder through the U.S. economy. With few options available and even fewer clues, President Lane unleashes Troy Pearce and his Drone Command team to find and stop the untraceable source of the destabilizing attacks. But the terror mastermind proves more elusive and vindictive than any opponent Pearce has faced before. and if Pearce fails, the nation will suffer an unimaginable catastrophe on its soil or be forced into war"-- Provided by publisher.