Rollins' experiences and expertise as an amateur spelunker and a certified scuba diver have provided content for some of his novels, which are often set in underground or underwater locations.

[1] In an August 16, 2012 interview, Rollins told SLM's Jeannette Cooperman: For 20 years my paycheck was coming from my veterinary degree and my writing was my hobby, and I thought it would be really cool to flip that around.

Additionally, he was inspired by Jules Verne and H. G. Wells,[6] whose works he used as a springboard for creating similar contemporary novels filled with what he refers to as "the three M's of fiction: magic, mayhem, and monsters".

[citation needed] Czajkowski sold his first novel, Wit'ch Fire (1999), under the pen name James Clemens, through Terry Brooks' publisher.

While deep in the South American jungle, Conklin's nephew, Sam, stumbles upon a remarkable site nestled between two towering peaks, a place hidden from human eyes for thousands of years.

Now, with the U.S. on the narrow brink of a nuclear apocalypse, Kirkland must pilot his oceangoing exploration ship, Deep Fathom, on a desperate mission miles below the ocean's surface.

Four years ago, all contact with a U.S. medical-scientific expedition in the wilderness of the Amazon basin suddenly ceased; the 30-man team was declared lost and likely dead.

Unable to comprehend this inexplicable event, the United States CIA establishes a special team to return to this impenetrable secret world of unforeseen perils and to follow the dead man's trail.

In 2008, Random House commissioned Rollins to write the novelization of Indiana Jones and the Kingdom of the Crystal Skull (2008), the eponymous, American adventure science fiction film.

After being decimated during the 2003 invasion of Iraq, the floodgates have been opened for the smuggling of hundreds of exotic birds, mammals, and reptiles to Western nations.

To uncover the truth about the origin of this strange cargo and the threat it poses, Polk must team up with a man who shares a dark and bloody past with her, now an agent with the CBP.

The magi brought gold, frankincense, and myrrh to the Christ child; their bones may bring destruction to the world if they are allowed to remain in the hands of the thieves who stole them.

The book also features the apparent death of Dr. Monk Kokkalis and introduction to Sigma Force of Joe Kowalski, who first appeared in Ice Hunt.

[12] In the medieval heart of Budapest, Captain Tucker Wayne and his war dog, Kane, rescue a mysterious woman fleeing three armed men.

They are after the secret she holds, which will unlock a terrible treasure steeped in blood and treachery and tied to a crime going back to the fall of Nazi Germany and a heritage of suffering and pain that reaches out from the past to wreak havoc today.

Sigma Force chases down clues related to Attila the Hun and his fateful meeting with Pope Leo I that stopped a Hunnic invasion of Rome.

All the while, a nearing comet interferes with the imagery of an orbital satellite, causing it to show an image of America's Eastern Seaboard in flaming ruins.

The team travels from California, near Yosemite National Park, to the tepuis of the northern Amazon rainforest, and to the ice caves of Antarctica.

In the dead of night, a faceless enemy hacks into the Smithsonian Institution's network of servers, but it is only the first strike masking a larger attack.

To rescue a biologist trapped in the National Museum of Natural History and discover the true intent behind an assault that grows bolder and bloodier by the minute, Sigma Force must unleash its most headstrong operative, Joe Kowalski.

[16] Two years ago, a famous archaeologist was thought lost in the Sudanese desert during a search for proof of the ten plagues of Moses.

When the medical team who performed the autopsy falls ill with a strange disease which quickly spreads throughout Cairo, Safia al-Maaz, who originally appeared in Sandstorm, reaches out to Sigma Force for help.

Meanwhile, Kat, Monk and the newly appointed Librarian of Congress, Elena Delgado, follow a trail of clues left across Europe by James Smithson, the mysterious founder of the Smithsonian Institution, to discover a possible way to contain the outbreak.

What Gray learns sets the team on a quest for answers to a mystery that reaches as far back as the Spanish Inquisition and to a reviled medieval text known as the Malleus Maleficarum (The Hammer of Witches).

But the route detours as the map opens to reveal a fiery river leading to a hidden realm underneath the Mediterranean Sea, the subterranean world of Tartarus.

Sigma Force must intervene when a research station in the Coral Sea comes under siege during a geological disaster that triggers earthquakes, tsunamis, and volcanic eruptions.

Before his murder, he manages to dispatch a coded message, a warning of a terrifying threat, one tied to a secret buried within the Golden Library of Tsars, a vast and treasured archive that had vanished into history.

A television adaptation of the book series is in development from Absentia creator Matt Cirulnick, Amazon MGM Studios, Leonardo DiCaprio ’s Appian Way Productions, Oakhurst Entertainment and Talaria Media.

Slogging hither and yon for scraps of clues, the three begin to suspect that the supposedly pacific gods are in fact engaged in an ongoing struggle for power and control.

But even Tylar's skill and magic cannot save the Citadel of Tashijan, ancient Shadowknight headquarters, for something foul lies at the heart of their Order.