This review will spoil the plot in full
Machen could only have disappointed. Praised by Lovecraft and Stephen King, Arthur Machen’s story will be known by horror fans, though rarely read. And if read, better left unread, if The Novel of the White Powder indicates his oeuvre. Machen writes competently, but he cannot justify the label ‘horror’.
Helen Leicester’s brother does nothing but study law. His idea of recreation involves sitting idly in a chair between case law binges. But even lawyers grow sick, and he requires a special medicine. Too special it turns out. The prescription he gets from Dr Haberden changes him – Francis wants a holiday! More than that he wants to give up the law altogether. He starts slumming around London. Helen doesn’t know what’s happened, or what she can do. Her brother rots in front of her, and the very weather seems to degenerate alongside him. Eventually, he shuts himself in his room, saying he’s studying law again. When Helen and Haberden knock down the door, they find a oozing mass. Haberden leaves England, never to return, but sends Helen his colleague’s analysis of the medicine. This white powder, left on the shelf so long, with the temperature rising and lowering, had become something… other. And it has something to do with medieval pagan devil-worshiping cults.