YMMV / Father Brown S 2 E 4

• Complete Monster: Ethel Fernsley, despite seemingly a harmless, grieving old woman, is truthfully a sociopathic attention seeker with one of the highest body counts of any killer. Faking being wheelchair bound solely to ensure she was constantly the centre of attention and could control others, for years Ethel murdered any of her farm's seasonal labourers who saw too much or threatened her facade—suffocating them by blocking the flue tube in the barn where they sleep and then feeding their bodies to her pigs. Working her daughter-in-law Violet like a slave, Ethel encouraged her vicious son Ivan's abuse of Violet—including him beating her into a miscarriage—and murdered the kind-hearted Piotr for trying to rescue Violet. Following her son Wilfred, who had discovered her method of murder, Ethel ran him over with the farm truck, crushing him to death. Finally caught, Ethel trapped Father Brown and Sid inside the barn to be devoured alive by the pigs.