During WWI, a fleet of British airmen are billeted at a house in the French countryside. One of these is Captain Blythe, the son of General Blythe. He falls in love with the girl who lives in the house, Jeannine, but his father intends for him to marry Lady Iris, an Englishwoman of his own social standing. Romeo and Juliet with a WWI backdrop and a happy ending.
I’m not sure exactly when it was published. The earliest copies I can find are all photoplay editions tying into the 1928 film starring Colleen Moore and Gary Cooper. The story was previously dramatized as a stage play in 1917, but I don’t know if the book came before or after that. It reads rather like a novelization. My guess is that the play came first, then the film and novel were released concurrently in 1928.