A seemingly random murder alerts scientist Dan Clifford to a global conspiracy that stretches from the halls of Washington to the Honduran coast. Illegal undersea activities have unwittingly uncovered a primordial secret that is wreaking havoc on aquatic life and the local human population. When the CDC and the full resources of a US "threat interdiction" team fails to uncover the source of the devastation, Dan and a brilliant marine biologist, Rachel Sullivan, must race to unravel an unimaginable, ancient mystery in the murky depths.

When ex-MI5 operative Joe Mason is sent to Rome to guard an elderly professor and his daughter, he thinks he’s in for an easy ride. But on their first day in the Vatican secret archives, a masked assassin gains entry, shoots Joe’s client in cold blood and steals an ancient manuscript. Giving chase, Joe can’t imagine what could lie within those pages that would make someone willing to kill. The search for answers leads Joe and his comrades in a race against time, across continents and into treacherous mountains.

England, 1351. The Pestilence has ravaged the land. Villages lie abandoned but for crows and corpses. Highways are patrolled by marauders and murderers. In these dark and dangerous times, the wise keep to themselves. But Gerard Fox cannot afford to be wise. The young knight has been robbed of his ancestral home, his family name tarnished. To regain his lands and reputation, he sets forth to petition the one man who can restore them. Fate places Fox on the wrong road at the wrong time as he hurtles towards a chance encounter. 

In the summer of 1601, Galileo Galilei made a startling discovery in the mountains of Eastern Italy that, if made public, could shatter faith in religion, bring down governments, and lead to worldwide turmoil. For more than 400 years, the secret has been guarded by a small group of incredibly powerful people, willing to do everything in their power to keep these discoveries from being made.

Coming from scandalous Florida treasure hunters and drug smugglers, Sloan McPherson is forging her own path, for herself and for her daughter, out from under her family’s shadow. An auxiliary officer for Lauderdale Shores PD, she’s the go-to diver for evidence recovery. Then Sloan finds a fresh kill floating in a canal - a woman whose murky history collides with Sloan’s. Their troubling ties are making Sloan less a potential witness than a suspect. And her colleagues aren’t the only ones following every move she makes. So is the killer.

Sarah Ridgeway is living the life she’s always envisioned. She has a devoted husband, a loving daughter, and a comfortable home. The path to reach it, however, has not always been smooth. For twelve years her husband, Bryce, served in the Army, deployed to some of the world’s worst trouble spots. After his service ended with a combat injury, the future had seemed precarious, but with Sarah’s support and that of his wealthy family, combined with his exemplary service record, he is elected to Congress.

After three decades in counterintelligence, Brad Trasker is retired, disillusioned, and dealing with a tragic loss. Spy games are behind him until he attends the launch of a next-generation aircraft. When the project of innovative aerospace CEO Kylie Connor explodes on the tarmac—nearly killing her in the process—Trasker is pulled back into the line of fire. The mystery of the sabotage quickly deepens.

All the world is a puzzle, and Mike Brink—a celebrated and ingenious puzzle constructor—understands its patterns like no one else. Once a promising Midwestern football star, Brink was transformed by a traumatic brain injury that caused a rare medical condition: acquired savant syndrome. The injury left him with a mental superpower—he can solve puzzles in ways ordinary people can’t. But it also left him deeply isolated, unable to fully connect with other people.

Harry Fox hunts artifacts for the Italian mob. When a forgotten manuscript suggests Great Britain's most famous king may not be fiction, Harry plunges headlong on a dangerous path to uncover the truth. Little does he know a shadowy alliance with ties to three of mankind's most powerful organizations follows his every move, desperate to stop him before he can uncover the truth behind the legend. Surrounded by enemies, Harry barrels across the globe and discovers the myth of King Arthur is far more real than anyone ever imagined. Can Harry survive to reveal the true story?

Amid a revolution, archaeologist Christopher Jordan and ancient manuscript expert Kathryn Ferguson travel to Syria in search of the original scroll of Marks' Gospel. Paralleling their quest is the story of the evangelist's escape with the scroll from the Roman siege of Jerusalem in 70 C.E., his struggles to complete the manuscript, and his journeys and efforts with the daughter of Peter the Apostle to protect and save it for the ages. For both couples, time is running out and enemies are closing in.