Registered sex offender Jeffrey Epstein could face new criminal charges more than a decade after a 14-year-old's parents went to the police alleging the girl was paid to give the billionaire a massage.

The 2005 investigation then led to accusations that he had abused as many as 40 young women, according to sealed documents from his plea deal in 2008 that were released seven years later.

Epstein pleaded guilty to a state charge - soliciting prostitution from a minor - in exchange for a guarantee not to prosecute him in federal court. He served 13 months of an 18-month sentence.

Two of Epstein's alleged victims are now seeking to have the plea overturned in a 'groundbreaking' lawsuit in Florida.

Registered sex offender Jeffrey Epstein could face new criminal charges more than a decade after a 14-year-old's parents went to the police alleging the girl was paid to give the billionaire a massage

'This is absolutely a groundbreaking case,' Meg Garvin, the Oregon-based National Crime Victim Law Institute told FOX.

'The victims are fighting to truly make victims' rights meaningful – to ensure that victims are informed and have a voice at every critical decision point,'

The civil case was filed by attorney Brad Edwards and retired federal judge Paul Cassel against the Department of Justice, claiming prosecutors offered Epstein a secret plea bargain that violated the Crime Victims' Rights Act.

The motion also referred to the plea deal as 'one of the most extraordinarily lenient plea arrangements in American history,' the Palm Beach Daily Express reported.

According to released court documents, Epstein's lawyers offered him a secret plea bargain.

A 2007 email from Assistant US Attorney Marie Vaillafana to Epstein's lawyer Jay Lefkowitz, acknowledged three of the women were notified after the Non-Prosecution Agreement was signed, before adding: 'You raised objections to any victim notification, and no further notifications were done.'

Under the Crime Victims' Rights Act, victims have 'the right to reasonable, accurate, and timely notice of any public court proceeding, or any parole proceeding, involving the crime or of any release or escape of the accused.'

Victims are also entitled to be 'reasonably heard at any public proceeding in the district court involving release, plea, sentencing, or any parole proceeding.'

Edwards claims victims did not attend hearings regarding the secret plea deal, and key evidence is still sealed, FOX reported.

Esptein pleaded guilty to state charge of soliciting prostitution from a minor and served 13 months of his 18-month sentence

A judge released a cache of sealed documents from his plea deal in 2008 that included emails from prosecutors to his lawyers that fueled suspicions they worked together to ensure he did not face the most serious charges.

In 2007, Assistant U.S. Attorney Marie Villafana sent an email to his lawyer Jay Lefkowitz stating: 'I wanted to tell you that I have compiled a list of 34 confirmed minors.

'There are six others, whose names we already have, who need to be interviewed by the FBI to confirm whether they were 17 or 18 at the time of their activity with Mr. Epstein.'

The emails also suggest that prosecutors failed to highlight Epstein's alleged crimes to the judges.

Villafana wrote to Lefkowitz in a September 19, 2007 email: 'I will include our standard language regarding resolving all criminal liability and I will mention "co-conspirators," but I would prefer not to highlight for the judge all of the other crimes and all of the other persons that we could charge.'

After the court documents were released in 2015, lawyers for the two women who launched the lawsuit claim that the exchanges 'demonstrate that the victims' allegations of a conspiracy between the Government and Epstein's attorneys to conceal the existence of a broad, non-prosecution agreement are not mere speculation, but appear to be well supported.'

Politico reported that the lawyers for the two women claim the exchanges show both parties 'negotiating to keep the judge in the dark about the full nature of the plea arrangement, as well as keeping the victims (i.e. "the girls") in the dark about the plea agreement until after Epstein's plea.'

The women, who cannot receive restitution from the government, are instead hoping for 'fundamental changes' to the justice system, according to attorney Edwards, FOX reported.

In addition to an apology from prosecutors or fines against the US Justice Department that would go towards a crime victims' group, the suit could also fight to strike down the part of the plea deal that guaranteed he would not be prosecuted in federal court.

A civil case was filed claiming prosecutors in the case offered Epstein a secret plea bargain that violated the Crime Victims' Rights Act. Pictured, a file photo of a Boeing 727. Epstein allegedly had a bed inside his that was used for sex in what became known as 'Lolita Express'

The Palm Beach, Florida police and the FBI both investigated charges that Epstein consorted with underage girls used for prostitution.

Court documents show that police found a 'clear indication that Epstein's staff was frequently working to schedule multiple young girls between the ages of 12 and 16 years old literally every day, often two or three times per day.'

One victim said under oath that Epstein molested her at least 50 times, beginning when she was 13.

She said she and other girls were lured to Epstein's home with promises of hundreds of dollars for modeling or for massaging him.