It doesn't seem right to call a book 'wonderful' when the subject matter is as grim as this. It's a novelised version of a true crime which happened in Penge, now a suburb of London, in the 1870s, and Jenkins wrote it in the early 1930s (it beat 'Frost in May' and 'A Handful of Dust' to a prestigious literary award). The eponymous Harriet is a rich young lady who had what we would now call learning difficulties, and she was married for her money and then shut away and neglected until she and her baby died of starvation. The stuff of Victorian melodrama is here rendered in a chillingly matter-of-fact, unflinching way which only heightens the tragedy of a vulnerable, trusting young woman in the hands of predators. Jenkins was apparently upset herself, by what she'd written, wondering how such a terrible thing could happen. All credit to her that she doesn't portray the Omans as soulless monsters, but corruptible, selfish and weak-willed human beings. What shocked Victorian and inter-war society should perhaps be less horrifying in an age of genocide and terrorism, but the tragedy here is undiminished.
I have also read two other Persephone titles, 'The Wartime Stories of Mollie Panter-Downes' and 'The Victorian Chaise-Longue' by Marghanita Laski and both were great, well-written reads. If you like the sinister, the tragic and the Victorians in a quality package, this is definitely worth a read.