Granny Nothing and the Secret Weapon

Ewen's school rugby team is rubbish. He's the best player in it and he can't play rugby for toffee. Everyone is despairing of ever winning a single game, until Granny Nothing decides to take things in hand. She's found them 'a secret weapon' but it's so secret that even the 'weapon' knows nothing about it...Meanwhile, Nanny Sue has discovered she's cursed. Granny Nothing's not terribly inclined to help. She's too busy being an international spy...