Sebastien Grenier, a former French spy, is working as a financial analyst in Zurich. However, his peaceful existence starts to disintegrate when he is recruited by a top French intelligence operative to discover how one of their own secret agents was found out and executed in broad daylight.

Switzerland 1523. The mercenary Hansli Gyr returns with his soldiers from Italy to his home in the Oberland. They have fought for the Pope and now find a religious upheaval in Switzerland.