Five years after the Biosyn incident, the planet's ecology has proven largely inhospitable to dinosaurs, and those remaining exist in isolated environments with climates resembling the one in which they once thrived. The three most colossal creatures within that biosphere hold, in their DNA, the key to a drug that will bring miraculous life-saving benefits to humankind — and an extraction team will race to the most dangerous place on Earth in order to obtain it.