Brain Cleaners

In a world where a select group are placed into people's minds. These 'brain cleaners', as the government likes to call them, clean and sort the memory files stored in others' minds. In her story, young Grace McLean must learn how to navigate through a young child's mind. She's had no experience and children's minds are hard to make it through. She has no guide through the brain, only the basics. How does she make it through?