Bobby Deerfield, a famous American race car driver on the European circuit, falls in love with the enigmatic Lillian Morelli, who is terminally ill.

Following a fall during mistletoe picking, Druid Getafix decides that it is time to secure the future of the village. Accompanied by Asterix and Obelix, he undertakes to travel the Gallic world in search of a talented young druid to transmit the Secret of the Magic Potion.