Fingersmith is a classic Sarah Waters book, in a similar style to Tipping the Velvet. The tale is set in the Victorian era, with Sue Trinder brought up amongst thieves trying to trick her new mistress Maud Lilly out of her fortune.
This is told almost as a detective story, with the threads of the “crimes” committed only being joined together very satisfactorily in the last few pages of the book: I couldn’t stop reading it.
The story twists and turns through backstabbings and love, with characters you like and hate in equal measure, as all have levels of grey rather than being purely good or evil. There is very non-Victorian behaviour in some sections of the story, but some country houses were supposedly renowned for such behaviour, with the condition that it only took place out of “town”.