An intruder enters Lady Felicia's (Nancy Carroll) bedroom, snapping on the light to reveal her niece Bunty (Emer Kenny). She's gone on the run after being photographed with a married man - can she stay with her favourite aunt? Felicia asks Father Brown (Mark Williams) and Mrs McCarthy (Sorcha Cusack) to look after Bunty while she attends business in London. They visit Davina, Lady Malmort (Frances Barber) to see how wayward girl Ruby (Caitlin Drabble) is faring as the new maid. Davina's son Bobby (Ed Cooper Clarke) is thrilled to see Bunty, insisting she stay for dinner. That night Bunty finds Ruby in her room trying on a stole, which Bunty gives to her. The next morning Bunty discovers Ruby's crumpled body outside and when Bunty's bloodstained stole is found, Inspector Mallory (Jack Deam) arrests her as the prime suspect...