The Razor's Edge

Larry Darrell is a pilot, wounded and traumatized in the first world war. He turns his back on a normal life to wander the world in search of meaning and happiness. His wanderings eventually land him in Paris, where he reconnects with his former fiancé Isabel and her new husband Gray, a victim of the 1929 stock market crash. In a place where none of them quite belong, they all must discover how to find happiness in their lives, and with each other.
The Razor's Edge has been adapted for film twice, with the most recent version starring Bill Murray.