Mr Twit is a foul and smelly man with bits of cornflake and sardine in his beard. Mrs Twit is a horrible old hag with a glass eye. Together they make the nastiest couple you could ever hope not to meet. Down in their garden, the Twits keep Muggle-Wump the monkey and his family locked in a cage. But not for much longer, because the monkeys are planning to trick the terrible Twits, once and for all . . .