During a gala museum event featuring precious Vatican artifacts, a group of men posing as Templar knights stage a daring robbery. Their primary interest is in obtaining a mechanical decoding device that can supposedly decipher the location of the Templar treasure. Archaeologist Tess Chaykin reluctantly works with FBI Agent Sean Daley to uncover the mastermind behind the plot and possibly locate the treasure.

At the New York Metropolitan Museum, four horsemen dressed as 12th century knights storm the gala opening of an exhibition of Vatican treasures and steal an arcane medieval decoder. For archaeologist Tess Chaykin and FBI agent Sean Daly, this is just the start of a suspenseful game of cat and mouse as they race across three continents in search of the enemy - and the lost secret of the Knights Templar.