The Madame Blanc Mysteries (2021)

S2E4 Episode 4

Jeremy and Judith have just acquired a secluded mansion in the countryside, but their excitement quickly turns to horror when they discover the former owner dead at the kitchen table, a distinctive key grasped in his hand. Caron enlists Jean's expertise to uncover the key's importance amidst a house filled with antiques. However, even Jean is taken aback by the secrets that the key reveals.