That's a very good point, Ailos. I was about to suggest that it may have been something to do with an old servant of Sauron; the name Melkor would indeed have been known to Gondor, from annals of Numenor.
The head of the cult would probably not have been the Mouth of Sauron. Assuming that he did survive Sauron's fall, unless he was of near-pure Numenorean blood he would be long-dead by the New Shadow -- set a hundred years after the War of the Ring. Still, it could have been him. (Lord of Angmar -- I doubt that he would take the name 'Mouth of Sauron' to head a dark cult with, instead assuming a new name for reference purposes.)
Mmmm... actually, the plot of this concieved book does sound more like fan-fiction writing, rather than anything authentic. A 'thriller' is undoubtedly what it would be, a short tale describing a one-off and novel event set in Middle-Earth.
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