Friends & Enemies (Promise for Tomorrow #1)
Terri Wangard

Flying cadet Paul Braedel's wife dies while he trains for the U.S. Army Air Corps. Following bereavement leave, he returns to B-17 "Flying Fortress" Bomber navigator training but he's lost his zest for life and heads to England, not caring if he lives or dies. When he and his crew are shot down over Germany, he evades capture and, for the first time since Rachel's death, hears the voice of God whisper guidance: Find Heidi.
When Heidi stumbles into a man she recognizes, she is shocked to realize he is a friend from her high school days in the United States, and the husband of her best friend Rachel. Aiding an enemy downed airman is punishable by execution, but she agrees to help.
Then they're betrayed.
A war-time adventure with romantic second chances.