NUMA director Dirk Pitt searches for the connections among newly discovered Roman artifacts, the rise of a fundamentalist movement, and the existence of a mysterious long-lost "manifest," which, if discovered again, may change the history of the world.

In the final days of World War II, the Japanese launch two submarines carrying a new strain of a deadly virus to the west coast of the United States, but years after the subs are lost at sea, someone plots to use their deadly cargo.

Dirk Pittman sets out to stop terrorists who want to blow up Washington, D.C., using two Doomsday bombs recovered from the sunken and presumed lost WWII cargo plane Vixen 03.

When a research ship manned by Dirk Pitt and members of the U.S. National Underwater and Marine Agency is nearly sunk by a vessel from the past, Pitt finds himself caught up in an ancient mystery with lethal ties to the present, matching wits with a malevolent and powerful adversary.

In May 1914, two couriers died in a watery grave taking with them the only copies of the the top-secret North American Treaty that gives Canada to the United States. No record of it exists. But in 1989 an international crisis prompts research that uncovers the treaty's existence. Dirk Pitt gets the call to rescue the document, a treaty between the United States and Britain.