In the Father Brown episode " The Whistle in the Dark " (Season 7, Episode 3), the detective-priest investigates a series of murders linked to a supposedly haunted,, valuable medieval whistle that brings out greed and superstition in its owners. When a,fake séance aimed at increasing the artifact's value for a debt-ridden friend leads to death, Father Brown must uncover a killer who uses supernatural claims to mask their crimes. You can watch this episode on Apple TV or BritBox . "Father Brown" The Whistle in the Dark (TV Episode 2019)