A new book revealing the "terrifying ordeal" suffered by Amanda Knox will be published next month, as she faces a fresh trial for the murder of British student Meredith Kercher.

Knox's aquittal for the 2007 murder was overturned by Italy's highest court earlier this week. Knox and her former boyfriend Raffaele Sollecito will now face a retrial.

However Harper Collins says it will proceed with the publication of Knox's new book, entitled Waiting to be Heard, on 30 April, and this will not be affected by the court ruling.

Describing the book, Harper Collins said on its website: "For the very first time since her trial for murder, her four-year incarceration in Italy, and her appeal and acquittal of all charges, Amanda Knox will share the truth about her terrifying ordeal."

Lawyer Robert Barrett told the Daily Telegraph: "People will see when Amanda Knox goes public... that she is mature beyond her years.

"While people know the story of the trial, they don't know the personal story, the family's story, the prison story and, believe it or not, the legal story. Aspects of that revealed in the book will shock you to the core."

Knox will also give an interview with ABC's Diane Sawyer on 30 April, her first major sit-down interview since she returned to America following her aquittal two years ago.

See-saw interview

Knox, a student at the University of Washington, was sharing a flat with Kercher when the Briton was murdered. She and Sollecito were convicted of the murder in 2009, and sentenced to 26 and 25 years respectively.

Both parties were aquitted in October 2011, when an Italian appeals court criticised the prosecution's case. However the aquittal was overturned this week after judges upheld an appeal from the prosecution.

Speaking after the Italian Supreme Court's ruling earlier this week, Knox said in a statement that the decision was "painful" and that she and her family would stay strong and fight the case.

"The prosecution responsible for the many discrepancies in their work must be made to answer for them, for Raffaele's sake, my sake, and most especially for the sake of Meredith's family. Our hearts go out to them," she added, according to a report in ABC News.