A Forbidden Love — Meg Hutchinson

Robbed of marriage to the man she loved, Leah Bryce rears his daughter Miriam as her own. But her desire for vengeance lead her to treat the girl with extreme cruelty. Leah's son Ralph has always loved the girl he believes to be his sister, and fights to subdue feelings that are more than brotherly. Only when Leah's malign influence is removed for ever can Miriam overcome the horrors of her girlhood to find love and joy at last.