IT is one of the greatest mysteries of the modern age.

But an air accident investigator with roots in the Borders believes he has uncovered the most credible explanation to the disappearance of Malaysian Airlines Flight 370.

And New Zealander Ewan Wilson will bring his best-selling account to Galashiels today (Wednesday) - the hometown of his father, Doug.

The 48-year-old commercial pilot and founder of Kiwi Airlines will donate copies of his best-selling Goodnight Malaysian 370 book to the town’s library and Galashiels Academy.

Mr Wilson told the Border Telegraph: “My father, William Douglas Wilson, emigrated from Scotland around 50 years ago.

“His father was a gardener to a local doctor in Gala and this is where he got the inspiration to work in medicine. I have been back to Galashiels twice but this is the first time I’ll be bringing one of my books with me.

“Although Goodnight Malaysian 370 is a best-seller as an e-book and print-on-demand in the UK these will be the first proper paperback copies in the country and I want them to be in Galashiels.

“I’m hoping the library and Academy will take a few donated copies.” Malaysian Airlines Flight 370 with 239 passengers vanished during a routine flight between Kuala Lumpur to Beijing earlier this year.

Despite a multinational search effort, which is now the largest and most expensive of its kind in history, no trace of the plane has yet been found. And the subsequent police and air authorities’ investigations have led to more questions than answers, with countless theories springing up.

Goodnight Malaysian 370 is the first in-depth expert study into the plane’s disappearance.

And Mr Wilson believes he has uncovered the most credible explanation.

His theory, based on painstaking research and industry-standard analyses of every possible scenario as well as exclusive interviews with family members of those on board, Ewan has produced a gripping account of what did happen - and what is likely to have happened when Flight 370 disappeared from the radar monitors.

Apart from finding the plane itself, this is as close as you will get to discovering the truth behind that fateful flight.

Mr Wilson continued: “I teamed up with the journalist Geoff Taylor, who writes beautifully. We set out all the questions and then one-by-one answered them using robust methodology and research.” Goodnight Malaysian 370 looks at what may have happened to the 239 passengers in the hours preceding the crash, why hijacking or any other terrorist incident was extremely unlikely, what happened to the crew, and why its suicidal, mentally-unstable pilot Zaharie Ahmad Shah was to blame. While much of Goodnight Malaysia 370 reads like a novel, the complexities of how the aircraft was able to vanish without trace are fully explained.

The alleged culpability of Malaysian and Vietnamese air traffic controllers is probed and the burning question of why the plane has never been found is answered. Ewan added: “We gradually eliminated possibilities until we were left with three scenarios - two of them being very-very unlikely but still not entirely disproved.

“But all of the evidence points towards the pilot, Zaharie, committing suicide - and committing mass murder. When we realised what we were dealing with we went back 32 years and discovered that this is not unique - there have been five other pilots who have almost certainly committed suicide.” Mr Wilson, who is about to embark on a UK-wide author tour, will spend today and tomorrow in Galashiels and will also visit family in Selkirk.

Goodnight Malaysian 370 is currently available only from Amazon, but further distribution through high street stores is being finalised.