Synopsis by Hal Erickson
An old "urban legend" stemming from an incident at the 1893 Paris Exposition is the inspiration for this episode. While visiting London, Jessica (Angela Lansbury) comes across a corpse in her hotel room. She summons the authorities, only to find that the corpse has disappeared--and subsequently, virtually everyone, including the police, adamantly insist that there never was a body, and that Jessica is merely imagining things. Ingredients essential to this intriguing yarn are a double espionage agent, a Scotland Yard detective, a slimy concierge, and a brazen "tart".