All is Not Enough by Meg Hutchinson
With mounting disbelief, Regan Trent realises that the death of her beloved mother has left her totally at her stepfather's mercy. But mercy is a foreign concept to Sherwyn Huntley. To this ruthless man, Regan is simply an obstacle between him and the Trent fortune. Denied a place at her mother's funeral, cruelly separated from her younger brother, promised in marriage to a sadistic pervert, Regan prefers to take her chance in the wide world. But Huntley will stop at nothing to achieve his cruel ambitions . . .