I'd never heard of her, but was reading a mini-review of "A Song Begins."
She was not only a prolific novelist, but something of a heroine in WWII.
https://en.wikipedia.org/wiki/Mary_Burchell
https://www.fantasticfiction.com/b/mary-burchell/
https://openlibrary.org/authors/OL892147A/Mary_Burchell