Mónica’s parents and their neighbors organize a party to celebrate the coming of summer. Surrounded by delicious Puerto Rican food and Caribbean music, Mónica and her friends see a new guest arrive at the party. This is Luis, a boy who just came from Puerto Rico. Luis is sharply dressed, sings very well and all the adults at the party applaud his talents. Monica and her friends decide to give Luis a big scare. Mónica never imagines that at the end of the party, she and her friends will be the ones who will learn a very important lesson.