Sarah Waters is a brilliant story teller. We’re in Camberwell in 1922 for her latest novel The Paying Guests. Our protagonist is Frances Wray, a spinster in her mid-twenties who lives with her mother in their large house. They have divided it up to rent out some of the rooms to a young married couple, Mr and Mrs Barber, to help pay for the running of the property. So far, so straightforward.