The class are on a trip to an old mill. Their teacher tells them the story of the miller's wife, who long ago kept the mill bright and clean. But is there more to the old tale? This story is part of the "Oxford Reading Tree: Treetops" series of fiction with built-in progression for pupils aged seven to 11. Specially written for children who need the support of carefully monitored language levels, the stories aim to be accessible, motivating, and humorous. The series is organized into "Oxford Reading Tree" stages (from Stage 10 to Stage 14), with each stage introducing more complex narrative forms, including flashbacks and changes in viewpoint; descriptive writing; extended reading vocabulary; and more pages, more text, and fewer illustrations. Each stage is supported by a teacher's guide, which offers guidance on using "Treetops" to assess children's reading ability, and includes a variety of activities, many on photocopiable sheets.