Ondine tells the story of Hans and Ondine. Hans is a knight-errant who has been sent off on a quest by his betrothed. In the forest he meets and falls in love with Ondine, a water-sprite who is attracted to the world of mortal man. The subsequent marriage of people from different worlds is of course folly. By turns comic, enchanting, and tragic, Ondine is considered by some to be Giraudoux's finest work.