The Duchess Theatre is a West End theatre in the City of Westminster, London, located in Catherine Street near Aldwych.

Blithe Spirit is a comic play by Noël Coward, described by the author as "an improbable farce in three acts". The play concerns the socialite and novelist Charles Condomine, who invites the eccentric medium and clairvoyant Madame Arcati to his house to conduct a séance, hoping to gather material for his next book. The scheme backfires when he is haunted by the ghost of his wilful and temperamental first wife, Elvira, after the séance. Elvira makes continual attempts to disrupt Charles's marriage to his second wife, Ruth, who cannot see or hear the ghost.