Millie Theale is a fictional character from the novel "The Wings of the Dove" written by Henry James. She is a young American heiress who travels to Europe in search of health and happiness. Millie's character embodies innocence and vulnerability, as she navigates the complexities of love and friendship. In the story, Millie becomes entangled in a web of relationships with other characters, including Kate Croy and Merton Densher. Her wealth and charm attract attention, but her fragile health adds a layer of poignancy to her interactions. Millie's journey reflects themes of desire, sacrifice, and the impact of wealth on human connections.