The new children's book from No. 1 bestselling author David Walliams - an extraordinarily brilliant and rollicking mystery adventure illustrated by artistic genius, Tony Ross, and the sequel to the much-loved and bestselling Gangsta Granny. Ben is getting used to life without his beloved granny. She was a cabbage enthusiast, a Scrabble partner... and an international jewel thief known as The Black Cat. Now, only the memory of their extraordinary adventure to steal the Crown Jewels lives on. Then something inexplicable happens. World-famous treasures are stolen in the dead of night and the clues point to none other than The Black Cat? But that's impossible...?