WHAT IT'S ABOUT: In the 1970s, merciless killer Charles Sobhraj preys on travelers exploring the "hippie trail" of South Asia. WHAT WE THOUGHT: The Serpent, now streaming on Netflix. What followed was an Easter weekend binge and hours spent on the internet, getting to know the man identified and later charged as a murderer, thief and seductive master of disguise in the mid-70s. The Serpent, which first aired on BBC One earlier this year, follows Dutch diplomat Herman Knippenberg (Billy Howle) as he investigates the disappearance of a pair of Dutch backpackers in Bangkok. With recruited help from anyone he can get, including his then-wife, Angela (Ellie Bamber), his pursuit leads him to Sobhraj (Tahar Rahim) and his accomplices, including Marie-Andrée Leclerc (Jenna Coleman) and Ajay Chowdhury (Amesh Edireweera). All of whom have been drugging, robbing and killing young tourists travelling between Europe and South Asia.