V.C. Andrews 
Hidden Leaves 

From bestselling author V. C. Andrews comes the finale to the thrilling De Beers series, which finally solves the mysteries of the De Beers family…After the tragic death of her adoptive father, Willow De Beers receives an unexpected gift: a family diary that unlocks all the secrets of her worldand shatters the life she’s known in glitzy Palm Beach, Florida. At last, Willow learns the identity of her real father, and unearths his secret love affair with her real mother. She discovers the reasons for her adoptive mother’s cruelty…and the truth about the mysterious woman who couldn’t keep her, but would love her forever.