April 1945: The remnants of Nazi army leave the Czechoslovakia. But one unit takes time to hide and bury something in tunnel somewhere in Western Bohemia. 53 years later, there is construction at work and the tunnel entrance is discovered. Following the anonymous phone call, archaeologist Stanislav Novotný is dispatched to scout the area and discover if the find has any historical value. It has - and his search lead him to Prague, Amsterdam and Mexico, following the secret of the Mayans...