On Wings of Devotion by Roseanna White

 Phillip Camden is riddled with guilt over the death of his squadron during WWI.  Grounded because of the mishap, he now works for navy as a codebreaker. Arabella Denler works hard as a nurse to drown out her own feelings of loneliness and unworthiness. When fate throws Camden and Arabella together, they begin to see into each other's hearts, and have their own hearts healed in the process. But even as they do, outside evil is scheming to use their growing attachment to strike at the heart of British defenses.

This the second in a series of historical romances set in WWI and dealing with an elite group of codebreakers.  I haven't read the first in the series, but this book does a pretty good job of standing alone.  I have enjoyed all the Roseanna White books I have read. Some might think the religious elements a little heavy handed, but I enjoy them because they match some of my own religious philosophies. In this book it was interesting that the female protagonist isn't pretty and has had to struggle with that her whole life. White does a good job of showing how Camden gradually learns to look past her plainness to appreciate her character and inner strength.  Isn't that what all we plain women hope for? (2020, 400 p)