Marine explorer Dirk Pitt faces off against an elite army from an era gone-by in order to uncover the secrets of an ancient civilization in this #1 New York Times-bestselling series.
 
A group of anthropologists uncover strange inscriptions on the wall of a Colorado mine just as an explosion traps them deep within the earth. But their work won’t stay buried long. Dirk Pitt is on hand during the blast and quick to initiate...

"In May 1940, as the German army blitzes Europe and Parisians flee their city, the chief curator of the Musée de l'Armée is ordered to get a mysterious piece of cargo out of the country. When he arrives at the port of Le Havre and learns that his intended ship has been sunk, he places the object on a decrepit steamer that sails out under German fire. In the present day, Dirk Pitt and the NUMA agency are on a diving expedition in the English Channel...

A long-lost secret treaty becomes the top prize in a contest between Pitt and England's top agent.

Underwater adventurer Dirk Pitt and the NUMA crew investigate a black tide infesting the ocean off Nicaragua, a study complicated by the discovery of a mysterious artifact, a powerful storm, and a conspiracy.

"While investigating a toxic outbreak in the Caribbean Sea that may ultimately threaten the United States, Pitt unwittingly becomes involved in something even more dangerous--a post-Castro power struggle for the control of Cuba. Meanwhile, Pitt's children, marine engineer Dirk and oceanographer Summer, are on an investigation of their own, chasing an Aztec stone that may reveal the whereabouts of a vast historical Aztec treasure. The problem is, that...