Rio de Janeiro, the Wonderful City. Land of Ipanema, Corcovado, Sugar Loaf and... Ratatoing. The most refined and special restaurant of the city, where the chef is nothing less than a mouse. Everyone is crazy to discover the secret that Marcell Toing has to prepare his delicious receipts. But no one imagine the things he does to get his ingredients. Every thursday night, he faces a truly impossible mission with the charming assistant Carol and his friend Greg, a waiter that is more than disastrous. The three mice go out searching rare ingredients in the human's restaurant, confronting from mousetraps to a terrible cat. But the adventure of this group becomes even more risky when a cluster of envious mice, capable of everything, get together to put an end at the success of Ratatoing.