If you’re a fan of detective novels you’ll know this name almost as well as you know your own: Agatha Christie. She’s the mind that created Hercule Poirot and Miss Marple, and she put the Orient Express on the map... But there’s one Agatha Christie mystery that’s never been solved – and you’ve probably never heard of it. It’s the story of her own disappearance, on one December evening in 1926.

Guest: Bec Armitage for ABC Online