When a sickly Victorian woman dies suddenly, a postmortem reveals that her body contains a fatal dose of arsenic. Suspicion falls on her husband and her companion, who are lovers. Inspector Martin of Scotland Yard solves the mystery of her death... over a cup of tea.

• Romulus Films
• Elvey-Gartside Productions
• David Farrar
• Geraldine Fitzgerald
• Roland Culver
• Jean Cadell
• Mary Merrall
• Harcourt Williams
• Charles Heslop
• Ronald Adam