The fix was in.

Al Capone, the iconic Chicago gangster who in the 1920s gave a face to the American mob, got sandbagged by the legal system he had artfully abused for years.

The result: a conviction for income-tax evasion and a sentence of 11 years in prison.

But that wasn't the way it was supposed to play out.

According to Jonathan Eig, in his fascinating new book "Get Capone: The Secret Plot That Captured America's Most Wanted Gangster," Big Al was supposed to get 2Z\x years after pleading guilty in 1931 to income-tax evasion and Prohibition-violation charges.

The deal was worked about by his lawyers and federal prosecutor George Johnson, head of the U.S. Attorney's Office in Chicago.

Johnson knew he had a weak case built on circumstantial evidence and less-than-credible witnesses. He agreed to the deal, figuring any conviction involving Capone — who epitomized a criminal underworld out of control — was worth taking.

But the federal judge in the case, after what Eig implies was pressure from President Herbert Hoover, nixed the deal. Hoover, Eig writes, used to start each day with an exercise routine, but before he began, he would ask his Cabinet members, "Have you got Capone yet?"

Not only did Judge James H. Wilkerson sandbag the lawyers and prosecutors, Eig writes, but he also may have rigged the jury pool for the subsequent trial, making sure it was stacked with middle-aged or older white males from the suburbs.

Capone's lawyers had hoped for at least some ethnic, working-class Chicagoans as potential jurors. But there were none.

Eig's book is a sweeping account of Capone's life set against the backdrop of a city where corruption was the norm and a country dealing with the hypocrisy of Prohibition and the devastation of the Great Depression.

Federal court was the only place authorities had a shot at convicting Capone, Eig wrote, noting that city courts were a place where "crooked lawyers bribed crooked cops to testify the right way before crooked judges."

Capone had quickly established himself in the bootlegging business after moving from New York to Chicago.

He also generated income from gambling, extortion, narcotics and prostitution and was a suspect in more than a few murders. But he was never convicted of any of those crimes.

Eig has built his book around extensive research in court records and in newspaper accounts from the day — Capone was an unbelievably loquacious mob boss who was constantly granting interviews.

Some samples of his bons mots to reporters:

"You can get a lot farther with a smile and a gun than you can with just a smile."

"Ninety-nine percent of the people in Chicago drink and gamble. I've tried to serve them decent liquor and square games."

"If I were guilty of all the newspapers accuse me of, I would be afraid of myself."

In addition to positing that the judicial system was manipulated to send Capone to jail, the book also puts the lie to the theory that Capone was behind one of Chicago's more infamous mob hits — the St. Valentine's Day massacre.

More probable, Eig writes, is that the shootings, in which seven gangsters were killed, were carried out by police to avenge the murder of the son of a law enforcement figure.

Eig also says it was a bookish accountant with the Internal Revenue Bureau named Frank Wilson who built the tax case used to convict Capone.

In a short chapter titled "The So-Called Untouchables," Eig notes that Eliot Ness "gave terrific interviews" and that he came up with a "catchy nickname for his squad of gangbusters" that had newspaper reporters "dashing for their typewriters."

But while Ness' squad busted up some breweries, it did little to bust up the mob.

"Get Capone: The Secret Plot That Captured America's Most Wanted Gangster" by Jonathan Eig; Simon & Schuster (468 pages, $28).