Lost Horizon is a 1933 novel by the English writer James Hilton. The book was adapted into a film, also called Lost Horizon, in 1937 by director Frank Capra; and a musical film remake in 1973 by producer Ross Hunter with music by Burt Bacharach. It is the origin of Shangri-La, a fictional utopian lamasery located high in the mountains of Tibet. No. 1 on The New York Times Fiction best seller list for 1 week, from the issue of December 3, 1934. Wiki link