Deep in the African rain forest, near the legendary ruins of the Lost City of Zinj, an expedition of eight American geologists are mysteriously and brutally killed in a matter of minutes.

Ten thousand miles away, Karen Ross, the Congo Project Supervisor, watches a gruesome video transmission of the aftermath: a camp destroyed, tents crushed and torn, equipment scattered in the mud alongside dead bodies—all motionless except for one moving image—a grainy, dark, man-shaped blur.

In San Francisco, primatologist Peter Elliot works with Amy, a gorilla with an extraordinary vocabulary of 620 "signs," the most ever learned by a primate, and she likes to finger paint. But recently her behavior has been erratic and her drawings match, with stunning accuracy, the brittle pages of a Portuguese print dating back to 1642 . . . a drawing of an ancient lost city. A new expedition—along with Amy—is sent into the Congo, where they enter a secret world, and the only way out may be through a horrifying death . . .

They've eluded heat-seeking missiles, gone eyeball-to-eyeball with enraged 5,000-pound hippos, hacked through a jungle curtain. Still, the expedition continues. Amy, a gorilla who was part of a university learning experiment, is at last returning home. A professor (Dylan Walsh), electronics expert (Laura Linney), guide (Ernie Hudson), explorer (Tim Curry) and others follow the scampering ape. They know she will lead them to the place that's more than her home - it's the site of the fabled Lost City of Zinj and its diamond mines. But what they don't know can be fatal. Once they enter Zinj, they'll be the endangered species! From the best seller by Michael Crichton (Jurassic Park) comes an even-packed adventure filled with state-of-the-art technology and primal fear.