Seeds of Yesterday by Virginia Andrews

A past they cannot escape, a secret they cannot run from. Cathy and Chris haunted by the tragedies and sins of the past, return at last to Foxworth Hall where they were hidden so long ago. Despite every endeavour, they find that they are prisoners of a past they cannot escape... I loved every single word, it's an excellent read. The books in order 1) Flowers in the attic. 2) Petals on the Wind. 3) If there be Thorns 4) Seeds of Yesterday.