The episode is set at a country mansion hosting a murder mystery event called 'A dinner with death.' The guests participate in the event, but the fictional murder turns real when the actor playing the detective, Anthony Hart, is found stabbed to death during the event.

Key characters include Helena Hart, the hostess and sister of the victim; Anthony Hart, the murdered actor and former TV detective; Owen Hart, Anthony's son who discovers the body; DS Janie Mallowan, the investigating officer; and John Chapel, a detective and friend of Helena who assists in the investigation.

Janie and John must navigate a complex investigation involving a real murder during a staged event, a family feud over property and legacy, and the pressures of fame. They also deal with personal connections, as John is close to Helena, and Janie faces the challenge of proving herself to secure a promotion to DI.

The investigation uncovers a feud between siblings Helena and Anthony Hart over family property and legacy. It also reveals the pitfalls of fame, showing the true nature of Anthony Hart and the impact of his celebrity status on those around him.

John Chapel's past relationship with Helena Hart is rekindled during the investigation. His connection to the family and an unexpected link to a suspect remind him of the dangers of living in the past, which also helps Janie confront and let go of her own personal baggage.