David Walliams presents to us another hilarious book for kids about the one thing young people think is boring – their grannies. If you think your granny sucks Murray Mints all day, plays Scrabble and always wears mauve, then think again for she could be an international jewel thief.

Every Friday night, Ben goes to his boring old Gran's house to do the usual, play silly board games and eat cabbage soup but suddenly Ben discovers that his 90-year-old granny is actually an international jewel thief who goes by the name of The Black Cat. Gran enlists Ben's help to steal the most famed of all jewels – The Crown Jewels.

It's a really funny book and the relationship between Ben and his Gran is really sweet, you wish your granny were like her. It's hilarious and will make you cry. David Walliams hits a high note.