When the Little Miss Naughty decides to spend a day at the zoo, it's not just the cheeky monkeys who are causing trouble! And to make things worse Mr Mischief is also there and determined to be even more mischievous than Little Miss Naughty!

The Mr. Men and Little Miss Every Day series takes Roger Hargreaves' beloved characters on trips and activities that children will recognise from their own lives. All the stories have a `Where's Walter' feature with Walter the worm hiding in every book making for a fun and interactive reading experience for children aged two years and up.