Time Out of Mind by Rachel Field

Lost Horizon’ is a 1933 novel by English writer James Hilton. It is best remembered as the origin of Shangri-La, a fictional utopian lamasery high in the mountains of Tibet. While attempting to escape a civil war, four people are kidnapped and transported to the Tibetan mountains. After their plane crashes, they are found by a mysterious Chinese man. He leads them to a monastery hidden in “the valley of the blue moon” — a land of mystery and matchless beauty where life is lived in tranquil wonder, beyond the grasp of a doomed world.