Kenny MacAskill is set to publish a book revealing details about his own investigation into the Lockerbie bomb attack.

The former justice secretary has signed a deal with a major London publisher that will focus on far more than just Mr MacAskill's own personal involvement in the case.

In 2009, he released Libyan security operative Abdelbaset al-Megrahi, the only man ever convicted of the crime, on compassionate grounds.

The veteran politician - who stands down as an MSP next month - will use years of experience, insight and contacts to shed light on Scotland's biggest crime of the modern era.

Mr MacAskill said: "I can confirm I have a contract with Biteback to publish a book on Lockerbie and that I am represented by Caroline Michel."

Biteback, which is owned by tycoon Brian Ashcroft and Conservative commentator Iain Dale, specialises in major political books.

Recent publications include Lord Ashcroft's controversial biography of David Cameron "Call Me Dave", the autobiography of UKIP leader Nigel Farage and the independence referendum memoires of Alan Cochrane, the Scottish editor of the Daily Telegraph.

The book will be the latest to try and unravel why Pan Am Flight 103 crashed in to a Scottish town, killing 243 passengers, 16 crew and 11 people on the ground, in December 1988.

It will view the single event as part of a far wider process that began long before the bombing and continues to the present day.

Mr MacAskill was tight-lipped about details to be revealed in the book. But Lockerbie-watchers will look out for hints of diplomatic intrigue surrounding Lockerbie and the remarkable effort to have Mr Megrahi brought to justice.

Mr Megrahi died in Libya in 2012 continuing to protest his innocence. Scottish and US law enforcement agencies are convinced Libya was responsible for the mass murders.