The Wanting Mare is a science fiction film that takes place in the city of Whithren, a place where the inhabitants dream of escaping to the world of Levithen, a place where the sun never sets. The story follows Moira, a young woman who is determined to leave Whithren and start a new life in Levithen. However, her plans are disrupted when she discovers a mysterious baby who has the power to change the fate of both worlds.