Deep-sea explorer and government operative Kurt Austin must save the world from a deliberate viral outbreak in this thriller from the #1 New York Times -bestselling author In the Micronesian islands, a top-secret U.S. government-sponsored undersea lab conducting vital biomedical research on a rare jellyfish known as the Blue Medusa suddenly disappears. At the same time, off Bermuda, a bathysphere is attacked by an underwater vehicle and left helpless a half-mile below the surface, its passengers—including Zavala—left to die. Only Kurt Austin’s heroic measures save them from a watery grave, but suspecting a connection, Austin puts the NUMA team on the case. Austin's team has no way to prepare for what comes next: a hideous series of medical experiments, an extraordinarily ambitious Chinese criminal organization, and a secret new virus that threatens to set off a worldwide pandemic. Austin and Zavala have been in tight spots before, but this time it’s not just their own skins they’re trying to save—it’s the lives of millions. Filled with the high-stakes suspense and boundless invention that are unique to Cussler, Medusa is the most thrilling novel yet from the grand master of adventure.