Mary Roberts Rinehart 
The Amazing Interlude [PDF ebook] 
(Illustrated Edition)

Sara Lee, a young American girl, went to the battlefront in France during WWI. There she started the little house of mercy where wounded soldiers found succor for a few hours each night. A young Allied spy used the little house and Sara to send messages to headquarters. Through the spy and Sara Lee, contrasts between nationalities were made. She was engaged to an American but fell in love with the spy. The once in a lifetime love they shared proved them both to be honorable and brave. Mrs. Rinehart's books have stood the test of time. She writes of things as pertinent today as they were in the early twentieth century. She had a command of language that never goes out of style.