A journalist descends into the dark underbelly of the Iranian holy city of Mashhad as she investigates the serial killings of sex workers by the so called "Spider Killer", who believes he is cleansing the streets of sinners.
Nima Akbarpour is an Iranian-British technology journalist who is working for BBC Persian TV from 2008 as a presenter. He is a technology and social media expert who made hundreds of reports and articles about these topics.