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Bask in the eighties, when the computer was every bit still a mystery, as it is even more so today, to  the not-so-young, a retiree finds his up to now well-ordered life, and his computer, suddenly in the control of an unseen, and at the first, un-welcome visitor.
He became the fickle finger of fate, whether he liked it or not   
It is one thing for a novice like him to feel the computer is running him instead of the other way about,

but he didn’t reckon his hard drive would involve him in murder - and more .