The Paying Guests
At the moment I am 380 pages into the 440(ish) of this novel by Sarah Waters and am finding hard to put down. It's on my ereader.
I have read all her other works and have enjoyed them, some more than others - a couple of books involving the supernatural left me a bit cold but others were, like this one, impossible to put down. I am not sure whether Fingersmith or The Night Watch is my favourite until now.