The ancient order of the Knights Templar possessed untold wealth and absolute power, until the Inquisition destroyed them and their riches were lost forever.

But some people don't believe in 'forever'.

Ex-agent Cotton Malone used to work for Stephanie Nelle in the US Justice Department. Now Nelle wants his help to crack a series of puzzles that have confounded experts for centuries - and could lead to the legendary lost treasure of the Knights Templar.

But someone else is on the trail - someone prepared to commit the ultimate crime to win the ultimate prize. Malone and Nelle find themselves in a heart-stopping race through the villages, castles and cloisters of Europe in pursuit of a secret that, in the wrong hands, could bring the world to its knees.