It promises power, wealth, even eternal life: The Holy Grail. The chalice of the Last Supper, in which Jesus' blood is said to have been collected, is one of the most important relics of Christianity. The National Socialists were already looking for him - in vain. Is the Holy Grail real or is there something else behind the myth? The historian and knight of the grail Dr. Michael Hesemann now claims to have found the true Holy Grail: The Santo Caliz in the Cathedral of Valencia. Together we go with Dr. Hesemann on the way of the chalice to the Spanish Pyrenees. Can the authenticity of the Grail be proven? Or does the trail lead to England, to King Arthur and his knights of the grail?