The fifth screamingly funny novel from David Walliams, number one bestseller and fastest growing children's author in the country.Hot on the heels of bestselling Gangsta Granny comes another hilarious, action-packed and touching novel - the story of a little girl called Zoe. Things are not looking good for Zoe. Her stepmother Sheila is so lazy she gets Zoe to pick her nose for her. The school b…