John Henry "Doc" Holiday and his team of a few good men are in the hunt of their lives. This time, the call of duty takes them from Savannah, Georgia, to the Bering Strait, to end the reign of terror of a dark army of Guardians, who cruelly engineer murders to look like suicides and procure trophies for the Forbidden Library of a diabolical mastermind known as the Keeper.

In France, a member of a secret guild is killed for the secrets he keeps. In Croatia, a stronghold is breached, and a treasure is stolen. At the Vatican, a corrupt pontiff views Kimball Hayden as a threat to his rule. When a Croatian stronghold is breached and scores are killed, a religious icon is stolen that contains a dark particle that’s powerful enough to either create worlds or destroy them. With a corrupt pontiff who sees Kimball Hayden as a threat to his power, Pope Clement XV mobilizes the Vatican Knight without his team to retrieve the dark particle.

During a visit to the United States, Pope Pius XIV is caught within the crosshairs of a lethal assassin. After scores of people are killed during an event featuring the Pope's address, a conspiracy theory emerges that the killings were conducted by one of the CIA’s own. As the data trickles in, it becomes clear that the assassin is none other than Shari Cohen. 

In Egypt, those within the Saint Catherine Monastery are brutally attacked and a secret that has been hidden for more than 3,500 years is stolen. In Zurich, an arms dealer makes an agreement with a band of elite terrorists for one-of-a-kind weapons of mass destruction, for a treasure that was presumed destroyed during the Exodus. When a conversation between two men is covertly videotaped by an operator of the CIA, Vatican Intelligence and the Mossad realize that the partial message received was filled with enigmas.

The time has come for Cassiopeia Vitt to sell her ancestral home. It sits on a Spanish bluff by the Mediterranean Sea, and bears the name Casa de Hace Mucho Tiempo, House of Long Ago. Trapped inside its walls are memories from a time when Cassiopeia was growing from a rebellious adolescent into a thoughtful young woman - regretful times when she often found herself estranged from her parents. Also inside, are 15 paintings, each one a masterpiece, together representing an investment in the 10s of millions of euros - her father’s private art collection - which she intends to donate.

In central Syria, villages are razed as young men are conscripted to join the ISIS faction. In a Doctors Without Borders camp which is overrun by members of the Islamic State, people are abducted along with a priest Father Savino. He also happens to be the brother of the Vatican’s Secretariat of State. From the green zone in Iraq, Shari Cohen, now a CIA consultant and operator, learns that she must appropriate intel from the resurging ISIS force to stop them from striking international targets.

For millennia, stories of God’s greatest prophets have inspired Christians across the world, urging them toward the kind of faith that compelled these celebrated sages of old. But one modern madman wants that power for himself - to conquer a world he views as filled with unrepentant sinners as he ushers in a new age of religious rule.

An ancient papyrus describing the death of Cleopatra reveals the secret location of the lost tomb of Alexander the Great, supposedly filled with priceless treasure. Elizabeth Harker sends the project team to Egypt to find out if the tomb and treasure still exist. It doesn't take long before people start dying. A secret cult has worshiped Alexander as the Sun God for thousands of years, and they're not about to let unbelievers desecrate the tomb of their god.

Four strategic nuclear bombs are hijacked by terrorists seeking revenge for the deaths of their families and comrades. Just one bomb can destroy everything within sixty miles of Ground Zero. An abandoned trailer linked to the missing nukes is found on the Gulf Coast. The Project is called in to investigate, setting the team off on a desperate race to find the terrorists before they detonate the bombs. Behind the scenes, the last surviving member of an ancient conspiracy is calling the shots. He's rich, he's powerful, and he's dying. He's got nothing to lose.

It begins in Africa.... A United Nations relief team in a small village in the Congo makes an alarming discovery. An unknown force is leveling the evolutionary playing field. Men, women, and children have been reduced to a dull, cattle-like state. The natural world surrounding them - plants and animals - have grown more cunning and predatory, evolving at an exponential pace. The insidious phenomenon is spreading across the African continent, threatening the rest of the world. But is it a natural event? Or more terrifyingly, did someone engineer it?

An elite Reichswehr unit is crisscrossing India in the spring of 1922 on the hunt for a rumored treasure that would be enough to fund and ultimately reignite the war-starved German army. Join freshly minted Intelligence Officer Richard Halliburton as he staves off assassins at sea, battles ferocious beasts in the jungle, braves the dangerous Khyber Pass, and explores an ancient Indian castle in search of a vast fortune - all while trying to stay one step ahead of the Reichswehr soldiers. 

A deep secret that only one man knew...until the whole world found out. Richard Halliburton, the world famous travel writer and explorer in the early 1920s and 1930s, embarked on a journey to explore the world. But he found much more than he ever imagined - and far more than he ever told. Following the end of World War I, the German Reichswehr set out on an ambitious - and unconventional - expedition to rebuild the military’s war chest beyond the auspices of the restrictive Treaty of Versailles.

Before Kimball Hayden became a Vatican Knight, he was the commander of the Pieces of Eight, a kill squad that worked as part of a black-arm force of the CIA. He kills with impunity and acts with the cold fortitude of a machine. But when he begins to question the morality of his actions and the motives of his superiors, he is placed within the crosshairs by high-end principals who want to see him dead.

When brilliant and eccentric scientist Liu Wangshu disappears from his apartment in China, the Ministry of State Security is furious and certain they know what's happened: a defection to the Americans. President Jack Ryan knows how valuable an asset Liu would be - the inventor is responsible for much of China's recent technological progress, with his latest project rumoured to be the biggest yet. The problem is that none of Ryan's team have any idea where Liu is. 

While traveling across the United States during the Papal Symposium, the papal plane, Shepherd One, is commandeered by a terrorist cell calling itself the Muslim Revolutionary Front. On board: a nuclear payload with half the yield that destroyed Hiroshima. Their demand to the US government: assassinate the five leading principals of Mossad.