The humble Zacarias goes to the big city with his wife to help their son who wants to be a Doctor. There he gets a job, and lives a lot of funny adventures as a taxi driver.
Two friends are looking for a quiet place where they can rest awhile. Soon they find the town they'd chosen to go is far from quiet. In fact, it's ruled by outlaws. And one of them is mistaken for the "Avenging Gunman", defender of the law.
Based on true events, the film tells the story of Brazilian outlaw Promessinha, one of the most famous and feared criminals of his time, depicting his crimes and cruelty, until his death confronting the police.