Ruby - V. C. Andrews

The only family Ruby Landry has ever known are her loving grandparents. Although her mother is dead and she has never met her mysterious father, Ruby is grateful for all she has, especially when her attraction for handsome Paul Tate blossoms into a wonderful love.
But Paul's wealthy parents forbid him to associate with a poor Landry, and when Ruby's grandmother dies, she is forced to seek out the father she has never known in his vast New Orleans mansion. There, in a house of lies, madness and cruel torment, a shameful deception comes to light, and Ruby must cling to her memories of Paul: for only their love can save her now.