Two candidates are vying to become chancellor of Germany. One is a patriot who has served for many years, the other a usurper, stoking the flames of nationalistic hate. Both harbour secrets, but only one knows the truth about the other. Everything turns on the events of one fateful day - 30th April 1945 - and what happened deep beneath Berlin in the Fürherbunker.

The tomb of China’s First Emperor, guarded by an underground army of terra-cotta warriors, has remained sealed for more than 2,000 years. Though it’s regarded as one of the greatest archaeological sites in the world, the Chinese government won’t allow anyone to open it. Why? That question is at the heart of a dilemma faced by former Justice Department operative Cotton Malone, whose life is shattered when he receives an anonymous note carrying an unfamiliar Web address.

Four United States presidents have been assassinated - in 1865, 1881, 1901, and 1963 - each murder seemingly unrelated and separated by time. But what if those presidents were all killed for the same reason: a clause in the United States Constitution - contained within Article 1, Section 8 - that would shock Americans? This question is what faces former Justice Department operative Cotton Malone in his latest adventure. When a bold assassination attempt is made against President Danny Daniels in the heart of Manhattan, Malone risks his life to foil the killing....

Once he was called the Sphinx, a man so inscrutable that neither his adversaries nor fellow intelligence operatives could predict his next move. Now a contract agent with a secret mission, Jonathan Wyatt has gone rogue. For eight years he's been scheming to kill two Federal agents, whom he blames for the loss of his career. But as Wyatt prepares for a final confrontation, he makes a discovery that stretches back to the horrors of World War II, to Martin Bormann and Eva Braun and to a fortune in lost gold.

When Napoleon Bonaparte died in exile in 1821, he took to the grave a powerful secret. As general and emperor, he had stolen immeasurable riches from palaces, national treasuries, and even the Knights of Malta and the Vatican. In his final days, his British captors hoped to learn where the loot lay hidden. But he told them nothing, and in his will he made no mention of the treasure. Or did he?

The Knights of the Golden Circle was the largest and most dangerous clandestine organization in American history. It amassed billions in stolen gold and silver, all buried in hidden caches across the United States. Since 1865 treasure hunters have searched, but little of that immense wealth has ever been found. Now, 160 years later, two factions of what remains of the Knights of the Golden Circle want that lost treasure - one to spend it for their own ends, the other to preserve it.

September 1861: All is not as it seems. With these cryptic words, a shocking secret passed down from president to president comes to rest in the hands of Abraham Lincoln. And as the first bloody clashes of the Civil War unfold, Lincoln alone must decide how best to use this volatile knowledge: save thousands of American lives or keep the young nation from being torn apart forever?

A provocative thriller posing a dangerous question: what if federal income tax is illegal? The 16th Amendment to the Constitution legalized federal income tax, but what if there were problems with the 1913 ratification of that amendment? Problems that call into question decades of tax collecting and could even bring down the US economy?

The pope is dead. Cardinals are beginning to arrive at the Vatican to select his replacement, but one has fled for Malta in search of a document that dates back to the fourth century and Constantine the Great. Former Justice Department operative Cotton Malone is in Italy, on the trail of legendary letters between Winston Churchill and Benito Mussolini that could rewrite history. But someone else is after the same letters, and when Malone obtains and then loses them, he's plunged into a hunt that draws the attention of the legendary Knights of Malta.  

As a child, former Justice Department agent Cotton Malone was told his father died in a submarine disaster in the North Atlantic. But now he wants the full story. He asks his ex-boss, Stephanie Nelle, to secure the military files. What he learns stuns him: His father's sub was a secret nuclear vessel lost on a highly classified mission beneath the ice shelves of Antarctica. But Malone isn't the only one after the truth.