Childhoods of Al Capone, the future ambitious gangster who'll try to become the crime boss of the prohibition era Chicago, and Eliot Ness, the future head of "The Untouchables", a team of incorruptible agents formed to stop Capone.
Capone and his allies start running the show and earning top dollar from booze smuggling. Ness becomes the head of the newly-formed Untouchables and he and his law-enforcement agents start working on Capone's downfall.
Ness' team hits Capone's operations hard. One of the raids ends in a shootout and two civilians are killed in crossfire. This leaves Eliot worried that things might escalate out of control if the raids continue to be violent.
Lingle, the sleazy journalist Ness used to feed Capone with false information about Ness' operations, is found dead. Ness is adamant to find the perpetrators. What he uncovers is a web of corruption.
The head of a local worker's union that's on strike is approached by Capone, who offers him help in the battle for his union members' rights. Ness warns the man that offers from scheming Capone always come at a heavy price.
The hunt for a serial killer who preys on children becomes Ness' priority for the time being. Ironically, Capone is also after him for his own reasons.
In an effort to catch the child-killer as soon as possible, Ness agrees to a temporary alliance with Capone. However, Capone has no intentions of giving the killer up to the police. If he catches him first, he will kill him.
Capone's unwilling Chinese mistress, whom he bought for himself from her father, witnesses Capone committing a murder. Now all Chicago is after her and Ness must find her first.
Capone orders Frank Nitti to sponsor a nice low-tier Irish boxer and family man Tommy Dolan. Dolan starts winning fight after fight, not realizing they're all fixed. The public loves him but Capone plans to cash in on him.
One of Ness' men, agent Michael Malone, is found drunk with a gun used to kill a mobster. Ness doesn't believe that Malone is guilty of this murder, but Capone wants him dead anyway.
When Capone tries to expand and take over the numbers racket (a form of illegal lottery) in Chicago's South Side, Ness has no choice but to make a temporary alliance with the current numbers kingpin there in order to stop Capone.
There's a new player in town - the moonshiners. When they cut into Capone's profits, he has no intention of tolerating competition, but they won't back down either. Instead, they propose a one-on-one showdown at sunrise.
Ness finds out that Capone is trying to form an alliance with the heads of the New York mafia, Lucky Luciano and Meyer Lansky. He must do whatever it takes to stop this and some bad publicity in the press might help.
