Garden of Shadows - Virginia Andrews

This novel spins a tale of dreadful secrets and dark, forbidden passions--of the time before Flowers in the Attic began. Long before terror flowered in the attic, thin, spinsterish Olivia came to Virginia as Malcolm Foxworth's bride. At last, with her tall handsome husband, she would find the joy she has waited for, longed for. But in the gloomy mansion filled with hidden rooms and festering desires, a stain of jealous obsession begins to spread... an evil that will threaten her children, two lovely boys and one very special, beautiful girl. For within one innocent child, a shocking secret lives... a secret that will taint the proud Foxworth name, and haunt all their lives forever!

The wicked curse of the Dollanganger family begins in... Garden of Shadows