In the interior of Rio Grande do Sul, a group of bandits is dedicated to stealing the profitable cattle of local residents. But local gaucho police known as "The Wide Brim", due to the recognizable large-brimmed hat, will not allow the gang to go unpunished.

After a misunderstanding, fearing arrest, cowboy Pedro flees the town of Vacaria, in Rio Grande do Sul. His lover, Rosário, learning of the mistake, hires a professional hitman, Alegrete, to bring him back safely. The ambushes fail, as Alegrete is constantly hampered by a disastrous nephew who accompanies him in the pursuit.