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.

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.