主播大秀

Today we explore a unique market - the market for art. The world's greatest paintings may be incredibly valuable but don't bother trying to steal one - you won't make any money, as Justin Rowlatt discovers.

He interviews former FBI agent Robert Wittman who's gone undercover to recover some of the most famous stolen artworks and who says that most criminals don't make a cent even from the most high profile heists.

We visit the greatest art gallery in the world - it's in Geneva - but one you'll never see inside.

Plus, we hear from Thomas Galbraith, of the artnet website, that despite the incredible sale prices of many artworks, art usually makes a very poor investment.

(Image: Edvard Munch's The Scream hangs in a gallery, people in front, Credit: Getty Images)