Illusionist Derren Brown returns with a new series to mess with our heads tonight in what will be his most ambitious experiment to date. He aims to persuade an unwitting participant to push another person off a roof, seemingly to their death. Yeah, DARK. The illusion investigates the powers of social compliance and how authority, peer pressure or ideology can be used to make people carry out horrific acts. His subject is Chris Kingston, a 29-year-old member of the public who is unaware he's being filmed or manipulated at a distance, and the setting is the gala launch night of a fictitious new charity called Push.