Pollution, war and overpopulation have darkened the skies, photosynthesis is failing and most of the Earth's 20 billion souls face starvation and death. The only hope for survival lays with the fertile fields of Mars, where a 30-year terraforming effort is turning vast swaths of the red planet to green.

India Summers is a librarian and a talented historian, so when a stranger asks her opinion on an ancient coin she is happy to oblige, but when the same man is murdered less than an hour later, it soon becomes apparent that there is far more to the situation than meets the eye. Recognising her unique talents for historical reference, she is quickly recruited by Brandon Walker, a security service intelligence officer investigating the strange disappearance of a very special young girl. 

Over 200 years ago, a covert expedition shadowing Lewis and Clark disappeared into the wilderness of central Idaho. Now, seven anthropology students and their professor vanish in the same area. The key to finding them lies in an ancient secret, one involving alchemy, gold, and immortality...a secret that men throughout history have sought to unveil. Michael Rempart is a brilliant archeologist whose colorful and controversial career has earned him admiring fans and implacable foes, but he is plagued by a troubling sense of the supernatural and a mysterious spiritual intuitiveness.

When a Catholic priest hangs himself during the pope's inauguration, his friend and ex-priest Alex Harker is dragged into a secret war that has been playing out on the fringes of society since the birth of Christ. The suicide sets into motion a planned timetable of terrifying events that will irrevocably change the world as we know it. 

An ancient secret means the difference between life or death in this chilling thriller. When the body of a poetry professor is found tortured in a deserted barn outside Florence, Inspector Perini is assigned to the case. No murder of passion, it is clearly a professional job. When, hours later, thieves break into Dante’s cenotaph, it seems the two crimes may be connected by some missing verses from the Divine Comedy. They could contain a code so valuable someone is willing to murder for it. But who? And why?

A 4,000-year-old mystery lurks in the hills of Georgia. While investigating a strange series of ancient symbols, an archaeologist vanishes, and a professor he entrusted with the secret is murdered. Former government agent Sean Wyatt learns of his friend's disappearance and the murder. Now he must unravel the clues to the ancient mystery that holds incredible power.

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.

When Alex MacLure’s friend and colleague dies he is determined to carry on her research into ancient Egypt. He finds she has left him a coded message, and, as he tries to make sense of it all, he discovers she was murdered. And now the murderer needs to silence him. With only a few clues and a mysterious object, Alex follows a trail from London to Cairo. He must crack the code and expose a shocking and inconceivable truth before the secret is buried for ever. 

An Englishwoman is found dead in a house near Rome. Her distraught husband enlists the help of his closest friend, Chris Bronson, who discovers an ancient inscription on a slab of stone above their fireplace. But who are the liars? And what is it they are lying to protect? Pursued across Europe, Bronson uncovers a trail of clues that leads him back to the shadowy beginnings of Christianity; to a chalice decorated with mysterious symbols; to a secret code hidden within a scroll. And to a deadly conspiracy which – if revealed – will rock the foundations of our modern world.

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.