A great junior fiction series about what makes us do the naughty things we do! Brigid Lucy tries to be good, but it doesn't always work. This could be due to the invisible imp hiding in her hair. When Biddy's pet slug dies in tragic circumstances, Dad promises to buy Biddy a new pet. But Dad is allergic to almost every pet in the pet shop and the consequence is a menagerie of mayhem! Things are made even worse when the invisible imp in Biddy's hair decides to get involved. She can't help but encourage Biddy into trouble.

A great junior fiction series about what makes us do the naughty things we do! Biddy is excited when she spots a real-life Princess Tower from the window of the train. So is the invisible imp that lives in her hair – it is going to lead to all sorts of trouble! Mum says the tower is a cathedral, but what do grown-ups know? When Biddy and the imp investigate further, they discover that Princess Rapunzel is trapped inside the tower. Can Biddy save the day?

A great junior fiction series about what makes us do the naughty things we do! The imp in Biddy's hair thinks she should be Biddy's best friend, but Biddy longs for a human best-friend. All the girls at school already have best friends, so Biddy plans to find a friend outside of school. Her plan is to head to the park on Friday with her Frisbee and see what transpires... But Mum is 'expecting again', and is too tired to take Biddy to the park. So Biddy accuses her mum of not wanting Biddy to have a friend, and then yells at her. When Biddy is sent straight to her room to think things through for ten minutes, it is the start of a whole string of consequences that get more and disastrous as the day wears on. The next day is even worse... especially as the imp does her best to keep Biddy for herself.