Book In introduces the Books in Greatness Scale - or BIGS. Charlie has developed a method of ranking books according to their greatness, with each being awarded a score out of 10. He explains the system, and he and Rupert award marks out of 10 to all the books they've covered so far. Who is the more generous? Who took it upon themselves to declare that Hamlet may not be a 10? Is The Great Gatsby really a great book? And is this a useful exercise or just a couple of balding middle aged blokes making up lists? Join Rupert and Charlie to decide.