It was a dark and stormy night around the time of Halloween. A secret message arrived addressed to Rutherford & Fry from a mysterious woman called Heidi Daugh, who demanded to know: "Why do people like to be scared? For example, going on scary amusement park rides and watching horror movies that make you jump.”

What followed was an investigation over two chapters, which would test our intrepid duo to their very limits. In this first instalment, they explore the history of horror, starting with its literary origins in the Gothic fiction classic 'The Castle of Otranto'.

Adam challenges Hannah to watch a horror film without hiding behind a cushion. She quizzes horror scholar Mathias Clasen to find out why some people love the feeling of terror, whilst it leaves other cold.

Sociologist Margee Kerr and psychologist Claudia Hammond are also on hand to explore why scary movies are so powerful and popular.

Presenters: Hannah Fry, Adam Rutherford

FIrst broadcast on BBC Radio 4 in 2019.