Madame Arcati is a fictional character from the play Blithe Spirit, written by Noël Coward. She is a quirky and eccentric medium who conducts séances to communicate with the spirit world. Her character is known for her humorous and somewhat clumsy approach to the supernatural, often leading to unexpected and comedic situations. In the play, Madame Arcati is invited to help a couple, Charles and Ruth, connect with the spirit of Charles's deceased first wife, Elvira. Her presence brings chaos and confusion, as Elvira's ghost becomes a central figure in the story, complicating the lives of the living characters.