The Reckoning — Sue Walker

It was a beautiful morning in June 1987 that eleven-year-old Miller McAllister's world fell apart...
That was the weekend that police found the remains of three missing teenage girls on the tiny Scottish island of Fidra. And that was the weekend that Miller's father, Douglas, was arrested for triple murder.
Thirty-two years later, Douglas has died and Miller returns home after decades of self-imposed exile. The McAllister family has always maintained Douglas's innocence - as steadfastly as Miller maintained his guilt. But when Miller is given the legal archive and a letter his father wrote to him just days before his death, suddenly everything looks less clear.
To excavate the past and discover the truth, Miller immerses himself in the terrible events of over thirty years ago and his family's darkest hour.. Was nothing quite as it seemed on that fateful June day? Could Douglas McAllister have been innocent after all?
And if he didn't kill the girls ... who did?