Few adventure writers built a literary universe as expansive as Clive Cussler. From shipwrecks and lost civilizations to secret organizations and world-threatening technology, his books repeatedly mixed history, treasure hunting, espionage, and larger-than-life heroes. Even after Cussler’s death in 2020, several of his major series have continued with different coauthors.

This ranking covers Cussler’s recurring fiction series as well as his two-book Sea Hunters nonfiction series and the two-book middle-grade Lacey and Casey Nicefolk series. Kurt Austin is counted within The NUMA Files, since Penguin Random House currently catalogs those adventures together, despite the early books often being marketed as “A Kurt Austin Adventure.” Likewise, Dirk Pitt Jr. is not separated from the larger Dirk Pitt series.

7

Lacey and Casey Nicefolk

The Adventures of Vin Fiz (Lacey and Casey Nicefolk Book 1) is available to purchase now through this link

Cussler’s smallest series is also his most unexpected. The two-book Lacey and Casey Nicefolk series was written for middle-grade readers and follows 10-year-old twins whose adventures revolve around a magical box capable of transforming toys into real objects. The Adventures of Vin Fiz, published in 2006, sends the twins flying across the country in a transformed Wright brothers-style airplane.

The second book, The Adventures of Hotsy Totsy, takes the same imaginative premise in a nautical direction. Lacey and Casey use their magical ability to transform a toy boat into the life-size Hotsy Totsy and enter a national boat race, with their dog Floopy joining the adventure. At just two books, it is obviously much smaller than Cussler’s adult franchises, but it shows how naturally his love of transportation, exploration, and high-concept adventure could be adapted for younger readers.

6

The Sea Hunters

The Sea Hunters (The Sea Hunters Book 1) is available to purchase now through this link

The Sea Hunters books are the biggest departure from Cussler’s usual fiction, but they are an essential part of his publishing legacy. The Sea Hunters, first published in 1996, documents his real-world underwater exploration work with the National Underwater and Marine Agency. The follow-up, The Sea Hunters II, published in 2002 and continued recounting expeditions searching for famous shipwrecks and other historically significant discoveries.

These books are especially interesting because they reveal where so many of Cussler’s fictional obsessions originated. The Sea Hunters II discusses searches connected to the Mary Celeste, the Carpathia, and L’Oiseau Blanc, alongside other maritime and aviation mysteries. Cussler’s real NUMA teams reportedly discovered and surveyed more than 75 historically significant lost ships, including the Civil War submarine Hunley, giving his fiction a direct connection to genuine exploration.

5

The Oregon Files

Golden Buddha (The Oregon Files Book 1) is available to purchase now through this link

The Oregon Files take Cussler’s action formula and crank up the espionage. Juan Cabrillo commands the Oregon, a highly advanced ship disguised as a dilapidated freighter, while his Corporation crew accepts dangerous missions for governments and intelligence agencies. The series launched with Golden Buddha in 2003 and now has 19 books, most recently Quantum Tempest, which centers on an artificial-intelligence weapon and a criminal alliance.

This series often feels like Cussler’s closest answer to a military-tech thriller. Sacred Stone, Dark Watch, Plague Ship, The Silent Sea, Piranha, Final Option, Marauder, Hellburner, Fire Strike, and Ghost Soldier repeatedly put Cabrillo’s unconventional crew against enormous threats. Its biggest strength is the ensemble: the Oregon itself almost functions as another character, providing gadgets, weapons, disguises, and an endless supply of impossible escape routes.

4

The NUMA Files

Serpent (The NUMA Files Book 1) is available to purchase now through this link

The NUMA Files take Cussler’s fascination with the ocean and turn it into a full-scale team adventure series. Kurt Austin leads NUMA’s Special Assignments Team alongside Joe Zavala, with missions involving everything from vanished aircraft to environmental disasters and ancient artifacts. The series began with Serpent, followed by Blue Gold, Fire Ice, and White Death, and now encompasses 22 books with Graham Brown’s 2026 Cold Fire.

The main attraction is the balance between Austin and the wider NUMA team. Unlike Dirk Pitt’s more singular heroic identity, the books frequently depend on specialists working together to solve impossible problems. Later entries such as Nighthawk, The Rising Sea, Sea of Greed, Fast Ice, Dark Vector, Condor’s Fury, and Desolation Code show how far the formula has expanded from maritime mysteries into technology, climate threats, biological dangers, and cyber warfare.

3

An Isaac Bell Adventure

The Chase (An Isaac Bell Adventure Book 1) is available to purchase now through this link

Isaac Bell gives Cussler’s formula a fascinating historical twist. Instead of modern submarines, secret laboratories, and high-tech espionage, Bell operates in the early 20th century as a detective for the Van Dorn Detective Agency. The first novel, The Chase, appeared in 2007, introducing a hero who investigates thieves, murderers, spies, and increasingly elaborate criminal schemes against the backdrop of American history.

The series reaches much of its appeal by turning real historical periods into adventure stories. The Wrecker, The Spy, The Race, The Thief, The Assassin, The Titanic Secret, The Saboteurs, The Heist, and 2025’s The Iron Storm show how the character has moved across automobiles, railroads, aviation, espionage, and World War I. With 15 numbered books currently listed by the publisher, Bell has become Cussler’s strongest alternative to his modern-day heroes.

2

Dirk Pitt Adventures

Pacific Vortex (Dirk Pitt Book 1) is available to purchase now through this link

The Dirk Pitt Adventures remain Cussler’s defining achievement because they introduced the character who established his entire brand of underwater adventure. The series began with The Mediterranean Caper in 1973, followed by classics including Raise the Titanic!, Vixen 03, Deep Six, Treasure, Dragon, Sahara, Inca Gold, and Atlantis Found. The publisher now lists the forthcoming Obsidian Sky as Book 28, scheduled for November 10, 2026.

Pitt’s greatest advantage is the sheer variety of the series. One story might revolve around a sunken submarine, another an ancient artifact, and another a technological threat with global consequences. Cussler also gradually expanded the family around Pitt, particularly after Black Wind, Treasure of Khan, and Arctic Drift, which involve his children Summer and Dirk Jr. That combination of continuity and enormous standalone plots keeps the series remarkably durable.

1

Fargo Adventures

Spartan Gold (Fargo Adventures Book 1) is available to purchase now through this link

The Fargo Adventures deserves the top spot because Sam and Remi Fargo offer what is the cleanest expression of what makes Cussler so addictive. The married treasure hunters chase lost fortunes through locations such as Nepal, the Caribbean, Egypt, and Europe, with mysteries often connecting ancient artifacts to modern conspiracies. The series began with Spartan Gold in 2009 and currently has 12 published novels, with The Serpent’s Eye scheduled as Book 13 for May 25, 2027.

What separates Fargo from several of Cussler’s more militarized book series is the chemistry between its protagonists. Sam and Remi are partners professionally and personally, so the adventures are not built around one unstoppable hero carrying everyone else. The Eye of Heaven, The Solomon Curse, Pirate, The Romanov Ransom, The Gray Ghost, The Oracle, and Wrath of Poseidon each show how easily the formula can move between archaeology, historical mysteries, and globe-spanning action.