I'm not a big reader of the WWII genre, as I prefer my fictional reading to be set in the 1800s, but from time to time I do find myself reading a book or two set in this era. The Wings of Nightingale series is written by Sarah Sundin. I recall reading the first book, With Every Letter, but for some reason I don't remember reading the second installment, On Distant Shore.
In Perfect Time centers on the Army Air Force flight nurse Lt. Kay Jobson, a character that also appeared in With Every Letter as a minor character and I presume she also appeared in the second book as well. Her romantic interests in the book is C-47 pilot Lt. Roger Cooper, another minor character from book one. I'm not going to go into detail about the plot here, as I don't want to spoil it for everyone else.
The author, Sarah Sundin, obviously loves the genre and did a lot of research, as she crafted detailed descriptions of the era throughout the novel; making the reader feel like they are actually in 1940s right there with the characters; dropping supplies to soldiers and helping the wounded. The romance never felt forced upon the characters, Kay and Roger, making me to believe that they actually loved each other.