The team gets to the bottom--literally--of a mystery concerning the cornerstones of our democracy. Laid by the ultra secretive Freemasons, this landmark piece of stone vanished. The search for the White House cornerstone has been on for over 200 years, everyone from Harry Truman to Barbara Bush have looked for it. Is it a coincidence...or is there a secret conspiracy tied to these stones and the buildings they were meant to support?

The team investigates the secret presidential codes of Thomas Jefferson and how they may be partially responsible for the death of one of the world's greatest explorers, Meriwether Lewis, of Lewis and Clark fame. Meltzer discovers that although the Lewis family has been working for 15 years to exhume his body, the National Parks is preventing the exhumation. This episode attempts to answer why the federal government would want to keep the body buried against the family's wishes and what really happened to the man who more than 200 years after his death remains our most iconic explorer.

Best-selling author Brad Meltzer and his team thought they knew what the Statue of Liberty stood for. But now they learn that America's most powerful icon of freedom might actually be loaded with secret symbols put there by a sinister group bent on world domination. They investigate claims that the Illuminati, a secret European society loosely affiliated with the freemasons, turned every inch of the statue into a coded message, from the torch Liberty holds high, to the rays emanating from the crown, even to the precise height of the statue itself. Things get even stranger when a highly regarded numerologist shows the team why he believes the statue is really a monument to the all-powerful number 7. As they evaluate these unsettling claims, Brad and the team are forced to reconsider whether one of America's most enduring symbols is really who she appears to be.

Best-selling author Brad Meltzer scours secret clues, symbols and conspiracy theories to unravel some of society's most provocative enigmas.

Best-selling author Brad Meltzer and his team dig into one of the Civil War's most enduring legends: that millions of dollars' worth of missing gold and silver from the Confederate treasury are still buried in secret hiding places across America. According the legend, the only way to find that buried treasure is to decode cryptic signs and symbols left behind by a shadowy Confederate group known as the Knights of the Golden Circle. Brad and the Decoded team join veteran treasure hunter Bob Brewer, whose lifetime effort to understand the KGC's secret code paid off when he uncovered a small fortune in buried Confederate coins. Bob soon shows just how well he understands those codes as he and the team follow KGC clues to the location of another possible treasure trove.

Best-selling author Brad Meltzer and the team jump at the chance to take on one of the FBI's most puzzling unsolved crimes: the 1971 disappearance of airline skyjacker D.B. Cooper, who bailed out of a jetliner at ten thousand feet over Washington state with two parachutes and two hundred thousand dollars in ransom money strapped to his body. Working closely with the former FBI agent who headed up the unsuccessful search for Cooper, Brad and the team examine new evidence that points to a former airline employee named Kenny Christiansen, whose own brother suspects he was actually the skyjacker who called himself D.B. Cooper. This sets up a climactic meeting between the Decoded team and Christensen's possible accomplice, the man who may have helped D.B. Cooper and his two hundred thousand dollar ransom vanish into thin air.