The real-life story of Dublin folk hero and criminal Martin Cahill, who pulled off two daring robberies in Ireland with his team, but attracted unwanted attention from the police, the I.R.A., the U.V.F., and members of his own team.

The daughter of a thief, young Moll is placed in the care of a nunnery after the execution of her mother. However, the actions of an abusive priest lead Moll to rebel as a teenager, escaping to the dangerous streets of London. Further misfortunes drive her to accept a job as a prostitute from the conniving Mrs. Allworthy. It is there that Moll first meets Hibble, who is working as Allworthy's servant but takes a special interest in the young woman's well-being. With his help, she retains hope for the future, ultimately falling in love with an unconventional artist who promises the possibility of romantic happiness.