Brigid Lucy tries to be good but it doesn't always work--this could be because of the invisible imp hiding in her hair Brigid Lucy, or "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! Her mom 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? This delightful chapter book focuses on what makes us do the naughty things we do.