From bestselling authors James Rollins and Grant Blackwood, the first installment in an exciting new thriller series based on the Sigma Force novels featuring former Army Ranger Tucker Wayne and his partner, Army working dog Kane, introduced in the New York Times bestseller Bloodline and the e-original story "Tracker."

Former Army Ranger Tucker Wayne and his military working dog Kane are recruited by Sigma Force to extract a Russian pharmaceutical magnate from Siberia. A scientific genius, the drug tycoon holds the biological key to a new weapon system, a danger engineered from the ancient past to terrorize the modern world.

From the frozen steppes of Russia to the sun-blasted savannahs of Africa, Tucker and Kane must piece together a mystery going back to the origins of life on Earth—before the ancient peril can destroy the heartland of America, and with it, all of humankind.

From James Rollins and Grant Blackwood comes the first in an exciting new series featuring Captain Tucker Wayne and his military dog, Kane, ripped from the pages of Sigma Force for their first solo adventure.

The mission seems simple: extract a pharmaceutical magnate with the secret to a deadly bioweapon from Russia. But nothing is as it appears to be. A desperate call from Painter Crowe, director of Sigma Force, thrusts Tucker and Kane into a race to rescue Abram Bukolov from assassins backed by a shadowy Russian general.

Hunted and betrayed at every turn, Tucker and Kane must discover the truth behind a horror out of the past that can be weaponized to terrorize the modern world. It will take all of their skill, talent, and trust in each other to discover the key to stopping an ancient peril with the power to destroy the world.

"The taut and complex story sprints across the globe from Russia to Istanbul to southern Africa to the United States, and offers a diverse cast of well-developed characters and a tightly woven plot that intrigues, excites, and doesn't let go."