Agatha Christie's Poirot (1989)

S1E9 The King of Clubs

Valerie St Clair, a charming young actress set to wed Prince Paul of Maurania, becomes the sole witness to the murder of the dubious and domineering producer, Henry Reedburn. Concerned for Valerie's reputation, Prince Paul seeks the expertise of Poirot to clear her name from police scrutiny. As Poirot delves into the case, he is confronted with a puzzling question: "When does a murder cease to be a murder?" The investigation unfolds with twists and turns, challenging the detective’s sharp intellect.