This is the love story of Gervase, Lord St Aubyn,and Diana Lindsay, supposedly a 'courtesan'. Diana is living with her six year old son in a very remote part of Yorkshire and whilst she lives peacefully she is restless. She saves the life of a mysterious stranger who fuels her desire for change and she moves to London. Here she meets Viscount St Aubyn and becomes his mistress. He is a very private and severe character and seeing their relationship develop in this story is really moving. They both have dark secrets in their pasts which you can sense but which are well hidden. St Aubyn finds himself drawn to Diana's warmth and unconditional love in spite of himself and whilst she loves him deeply she can sense that he is a very troubled character. His secret work for the government makes for an excellent subplot with a satisfactorily evil villain. This is a very moving and well written book about two very anguished people. I loved it. The distressing plot twist at the beginning which some reviewers complain about is quite a dark element of the story but IMO St Aubyn redeems himself and personally I don't have an issue with these types of storylines if they are written as well as this one.