Seven-year-old Cobjay lives in the English countryside. During his summer school holidays he goes to visit his Nana in London. While in London, his Nana starts to give him grass juice to drink every morning. What does Cobjay get up to as he tries to avoid having to drink the grass juice and how does he choose to exact revenge on his Nana for making him drink the juice? Read the story to find out more.
