The fabled Elephant Graveyard has been discovered. It contains enough ivory to make Ethiopia a wealthy nation. But the cave contains more than physical riches—it also holds the means to control the world. Fifteen scientists enter the cave. Only one leaves. Jack Sigler, Callsign: King (field leader of the covert, black ops Chess Team) receives a cryptic text from Sara Fogg, his girlfriend and CDC "disease detective". A catastrophic disease has been reported in Ethiopia’s Great Rift Valley, but Fogg suspects something more is going on. Her suspicion is confirmed when King's arrival in Africa is met by a high speed assassination attempt. As King fights against two competing, high-tech mercenary forces, each struggling for control of the deadly discovery, Fogg disappears. Working with the surviving member of the science team that made the discovery, King begins a search for Fogg and the source of the potential plague that takes him back to the Great Rift Valley, back to the Elephant Graveyard, and brings him face-to-face with modern man's origins. PRAISE FOR ROBINSON "Rocket-boosted action, brilliant speculation, and the recreation of a horror out of the mythologic past, all seamlessly blend into a rollercoaster ride of suspense and adventure." -- James Rollins, New York Times bestselling author of JAKE RANSOM AND THE SKULL KING'S SHADOW "With THRESHOLD Jeremy Robinson goes pedal to the metal into very dark territory. Fast-paced, action-packed and wonderfully creepy! Highly recommended!" --Jonathan Maberry, NY Times bestselling author of ROT & RUIN "Jeremy Robinson is the next James Rollins" -- Chris Kuzneski, NY Times bestselling author of THE SECRET CROWN "If you like thrillers original, unpredictable and chock-full of action, you are going to love Jeremy Robinson..."-- Stephen Coonts, NY Times bestselling author of DEEP BLACK: ARCTIC GOLD "How do you find an original story idea in the crowded action-thriller genre? Two words: Jeremy Robinson." -- Scott Sigler, NY Times Bestselling author of ANCESTOR "There's nothing timid about Robinson as he drops his readers off the cliff without a parachute and somehow manages to catch us an inch or two from doom." -- Jeff Long, New York Times bestselling author of THE DESCENT "Greek myth and biotechnology collide in Robinson's first in a new thriller series to feature the Chess Team... Robinson will have readers turning the pages..." -- Publisher's Weekly "Jeremy Robinson’s THRESHOLD is one hell of a thriller, wildly imaginative and diabolical, which combines ancient legends and modern science into a non-stop action ride that will keep you turning the pages until the wee hours. Relentlessly gripping from start to finish, don’t turn your back on this book!" -- Douglas Preston, NY Times bestselling author of IMPACT and BLASPHEMY "Jeremy Robinson is an original and exciting voice." -- Steve Berry, NY Times bestselling author of THE EMPEROR'S TOMB "Jeremy Robinson is a fresh new face in adventure writing and will make a mark in suspense for years to come." --David Lynn Golemon, NY Times bestselling author of LEGEND and EVENT