Agatha Christie is the master of the murder mystery. Over the dozens and dozens of people that died in her books – many were killed with poisons and chemistry.

But did you know that Agatha Christie’s poisons were accurate because she actually knew about them as a medical chemist? She worked in a chemist dispensary early in her life and passed her exams to making drugs.

In this video, chemist Kathryn Harkup describes 4 particularly interesting poisons used in her books.