Dawn of the Morning — Grace Livingston Hill

Though Dawn lived in a world of affluence, she couldn't find the comfort and love she so desperately needed. Her stepmother despised her, and her father ignored her. Then one day they came to her with shocking news: she was to be married--to the man of their choice.

Now it was Dawn's wedding day. She knew she should be filled with joy and anticipation. Instead, all she felt was hopelessness. For Dawn had finally found a man she could love, a man who seemed to understand her deepest thoughts and most-cherished feelings.

A man who was her fiance's brother .. .