This book by British author David Walliams will take you through the adventure of a young boy with a seemingly boring granny. That is, until Ben finds out she is an international jewel thief.

Ben's parents force him to stay with his boring old granny every Friday, and he absolutely hates it. She stinks of cabbage and insists on only playing scrabble. Soon, he finds out about her secret life as an undercover jewel thief by the name of Black Cat. Ben had no idea about this, and wants to join in...