Juanito is the owner of a record company that must prepare professional singer Marta to represent Spain in the Eurovision Song Contest with the song composed by her fiancé, Carlos. At the same time, Juanito has discovered a teen music group called La Pandilla, whom he takes to his house and hires Karina as a governess to educate them. She teaches the children singing and over time she gains their affection and love, and the interest of Carlos. Seeing that Carlos pays too much attention to Karina, Marta leaves for a rival record label. The children convince Juanito and Carlos to let Karina be the one to represent Spain in Eurovision with "En un mundo nuevo".
After Karina's real success at the Eurovision Song Contest 1971 where she placed second representing Spain with the song "En un mundo nuevo", the film was created inspired by her participation in the contest, featuring a fictional version of herself.[1] The film shows footage of Karina's actual performance in Eurovision filmed at the Gaiety Theatre in Dublin during dress rehearsals.[2]
