Mary Magdalene star Tahar Rahim for The Serpent, a new BBC One crime drama based on a real-life prolific killer from the 1970s. Rahim stars as serial killer Charles Sobhraj while Coleman plays Marie-Andrée Leclerc, Sobhraj's partner and frequent accomplice, and the story follows a team of investigators as they try and catch the duo after a series of murders across India, Thailand, and Nepal. The first episode aired on TV yesterday (January 1), with new episodes dropping every Sunday from tomorrow until mid-February. But they are also doing that thing where every episode is also available on BBC iPlayer already as well.