With a fervent yearning for respectability and enough money to buy herself a brand-new life in Rome, the uninhibited, fearless, determined former streetwalker Mamma Roma renounces her ignominious past to reunite with her loafing 16-year-old son Ettore. Free at last from her disgusting pimp and ex-lover Carmine, Roma is bent on making an honest living running a humble vegetable stall, but a malicious extortion scheme and the equally insidious menace of exposure threaten to put an end to her zealous aspirations for a decent bourgeois existence. For his own sake, Ettore must be spared the violence of the adult world; nevertheless, can a lone single mother protect her only son from the same snares that wounded her youth?