Ten years ago, a chance meeting at the Lighthouse Café in Redondo Beach led Sam Fargo and Remi Longstreet on the adventure of a lifetime, hunting the legendary riches stolen from the Persian King Croesus in 546 B.C. But someone else is after the gold and is willing to kill anyone who gets in his way. When Sam and Remi run afoul of a criminal drug-running operation, their hopes of finding the treasure are dashed. Years later they return to Greece on a mission to locate the cache of gold. Time becomes their enemy when the kingpin they helped send to prison over a decade ago is released --- and he has two goals in mind. Find the legendary hoard of King Croesus, and kill Sam and Remi Fargo.

In 533 A.D., the last Vandal ruler in North Africa consults an oracle on how to defeat the invading Byzantine army. The oracle tells the king that a high priestess cast a curse upon the Vandal Kingdom after a sacred scroll was stolen. In order to lift the curse, the scroll must be returned to its rightful home. But the kingdom falls before the scroll is found, leaving its location a great mystery…until a current-day archaeological dig, funded by Sam and Remi Fargo, uncovers some vital clues. The search for the ancient scroll is put on hold when the Fargos learn that a shipment of supplies intended for their charitable foundation's school has been stolen, and they travel to Nigeria to deliver new supplies themselves. But their mission becomes infinitely more complicated when they run afoul of a band of robbers.

In 1906, a groundbreaking Rolls-Royce prototype known as the Gray Ghost vanishes from the streets of Manchester, England, and it is only the lucky intervention of an American detective named Isaac Bell that prevents it from being lost forever. However, not even he can save the good name of Marcus Peyton, the man wrongly blamed for the theft. More than a hundred years later, it is his grandson who turns to Sam and Remi Fargo to help prove his grandfather's innocence. But there is even more at stake than any of them know. For the car has vanished again, and in it is an object so rare that it has the capacity to change lives.

In 1918, a ransom of enormous size was paid to free the Romanovs from the Bolsheviks. But the Romanovs died anyway. And the ransom? During World War II, the Nazis stole it from the Russians, and after that, it vanished. Until now. When a modern-day kidnapping captures the attention of husband-and-wife team Sam and Remi Fargo, the couple soon learn that these long-lost riches may be back in play, held in trust by the descendants of a Nazi guerrilla faction called the Werewolves. It is their mission to establish the Fourth Reich, and their time is coming soon. This quest is greater than anything the Fargos have ever done; it is their chance to make someone answer for unspeakable crimes, and to prevent them from happening again.

When husband and wife treasure hunters Sam and Remi Fargo try something new, a relaxing vacation, a detour to visit a rare bookstore leads to the discovery of a dead body. All signs point to a book in the store that may contain a secret map, an actual, ink-on-paper guide to a historic fortune. The Fargos take up the challenge and find themselves flying from California to Arizona, from Jamaica to England. Racing against a vicious corporate raider with an unhealthy obsession for this particular treasure, Sam and Remi are slowed by a new betrayal at every turn. It can only mean one thing: someone on their team cannot be trusted.