Ben is incredibly bored as every Friday he has to stay at his grandmother's house; her television doesn't work and all she likes to do is play Scrabble and eat vegetable soup.

However, Ben soon discovers things that change his view of her. His grandmother reveals to him that she was a world-class jewel thief and that her dream was to steal the Crown Jewels. Ben convinces his grandmother to do it together. And then the adventure begins...

A story about prejudice and acceptance, written in the witty and touching style of David Walliams.