Young woman goes looking for her missing boyfriend, a photographer last seen going down huge São Francisco River, in Brazil. On her search, she is told many stories about that river.

In the 1970s, "festivals" were incredibly popular in Brazil, as they were recorded before a live studio audience, and usually featured a number of elimination rounds. They also formed the springboard for the career of many a big-name stars, such as Chico Buarque, Caetano Veloso, Roberto Carlos and Gilberto Gil. Appearing on such a program was no cakewalk, however: audiences could be as wild in their condemnation as in their appreciation of an artist. Extensive archive footage (including performances and behind-the-scenes interviews) from the turbulent final evening of the Festival of Brazilian Popular Music 1967 paints a fascinating picture, not only of the transformation of Brazilian music into real "festival" music, but also of a society starting to buck against the yoke of military rule.