With no contract in view, Aimé Barelli, the leader of the band of the same name, decides to take a holiday. As this is the Holy Year, the young artist accepts to follow his mother on a pilgrimage to Rome. His band members - complete with their agent - decide to follow suit. Good idea because on the train to Rome, there is a whole class of charming schoolgirls, including charming Rosita and - surprise ! - Nicole, Aimé’s pretty but elusive beloved. The trip is cheerful but eventful and life gets even more complicated with the interference of Duranval, a fake talent agent but genuine trouble shooter. At a time confusion is such that a bomb explodes and the whole gang find themselves in … heaven! But Saint Peter has pity on them and sends them back to earth. At long last Aimé can marry Nicole while his musicians spread mirth around them;