It was to be a secret Melkorist religion of young misguided Men of Gondor in the early Fourth Age, after the events of The Lord of the Rings. It involves the worship of Saruman, Sauron, and Morgoth, led by someone named Herumor. Saelon, another key figure in the novel, might be a possible member.
Tolkien's comment on The New Shadow
- "I did begin a story placed about 100 years after the Downfall, but it proved both sinister and depressing. Since we are dealing with Men, it is inevitable that we should be concerned with the most regrettable feature of their nature: their quick satiety with good. So that the people of Gondor in times of peace, justice and prosperity, would become discontented and restless — while the dynasts descended from Aragorn would become just kings and governors — like Denethor II or worse. I found that even so early there was an outcrop of revolutionary plots, about a centre of secret Satanic religion; while Gondor boys were playing at being Orcs and going around doing damage. I could have written a 'thriller' about the plot and its discovery and overthrow — but it would have been just that. Not worth doing."
- —The Letters of J.R.R. Tolkien, Letter 256