It's Gergau's birthday. All our friends have gathered in the village the various people who appeared during their adventures... To start their appetite, they will attack one of the Roman camps cut off, and discover a prisoner, a Corsican, answering the name of Ocatarinetabellatchixtchix. Corsica, according to him, is "the nightmare of the Romans", to which Obelix will reply that it is also the nightmare of the Romans. To see how the Corsicans take care of the Romans, Asterix, Obelix and Idefix accompany Ocatarinetabellatchixtchixix in Corsica, the country of siesta, of the explosive cheese, and of the clans...