1944. As war rages across Europe and the Pacific, Army intel makes a shocking discovery: a three-hundred-foot Japanese submarine marooned and empty, deep in the Brazilian interior. A team of Army Rangers sent to investigate has gone missing and the military sends Captain R. J. MacCready to learn why the Japanese are there—and what they’re planning.

Parachuting into a mist-shrouded valley beneath a two thousand foot plateau, Mac is unexpectedly reunited with fellow scientist and friend Bob Thorne, presumed dead for years. Thorne, a botanist, lives with Yanni, an indigenous woman who possesses mysterious, invaluable skills. Their wisdom and expertise will prove lifesaving for Mac as he sets out into the unknown.

Soon, Mac learns of a diabolical Axis plot to destroy the United States and its allies. But there’s an even darker force on the prowl, attacking at night and targeting both man and beast. Mac has to uncover the source of this emerging biological crisis and foil the enemy’s plans . . . but will he be in time to save humanity from itself?

“Terrific.” —Steve Berry, New York Times bestselling author of The 14th Colony