Darling Girls by Sally Hepworth

For as long as they can remember, Jessica, Norah and Alicia have been told how lucky they are.  As young girls there were rescued from family tragedies and raised by a loving foster mother, Miss Fairchild, on an idyllic farming estate and given an elusive second change at a happy family life.

But their childhood wasn't the fairy tale everyone thinks it was.  Miss Fairchild had rules. Miss Fairchild could be unpredictable. And Miss Fairchild was never, ever to be crossed.  In a moment of desperation, the three broke away from Miss Fairchild and thought they were free.  Even though they never saw her again, she was always somewhere in the shadows of their minds.  When a body is discovered under the home they grew up in, the foster sisters find themselves thrust into the spotlight as key witnesses. Or are they prime suspects?