It's one of history's most enduring and controversial legends--the lost city of Atlantis. Archaeologist Nina Wilde is certain she's solved the riddle of its whereabouts--and with the help of reclusive billionaire Kristian Frost, his beautiful daughter, Kari, and ex-SAS bodyguard Eddie Chase, she's about to make the most important discovery in centuries. But not everyone wants them to succeed: a powerful and mysterious organization will stop at nothing...

"A legendary weapon. A ruthless assassin. A perilous hunt. Excalibur...Legend has it that he who carries King Arthur's mighty sword into battle will be invincible. But for more than a thousand years, the secret to the whereabouts of this powerful weapon has been lost...until now. Archaeologist Nina Wilde is hoping for a little R&R with her fiancé, former SAS bodyguard Eddie Chase. But the couple's plans are dashed when a meeting with an old acquaintance...

While the world is waiting breathlessly for archaelogists to break into a long-hidden vault beneath the Great Sphinx, student Macy Sharif discovers that a religious cult is already raiding the site, looking for a map to the lost Pyramid of Osiris. Threatened by the cult, she seeks help from the American archaeologist, Nina Wilde. Nina and her husband, ex-SAS bodyguard Eddy Chase, go on a treasure hunt from the streets of Manhattan to a yacht off Monaco...