When Tomorrow Comes — Janette Oke

Christine and her older brother, Henry, grew up in the Delaney family as loved and nurtured as if they had been born to Elizabeth and Wynn. Now adults, they are ready to make new lives for themselves.
Henry has found love and is planning a wedding. Christine is delighted for her brother, but she is still carrying scars from a broken relationship. And the war in Europe causes uncertainties at every turn, while the Northland still calls to her heart.
Amid this instability, more than one handsome young man shows interest in Christine, and she must make a decision. Is she willing to give up her dreams of a life in the North for a love to last a lifetime?