These books are part of the Oxford Reading Tree Level 7: Stories series, designed for children who are developing confidence and fluency in reading. The stories continue the popular adventures of Biff, Chip, Kipper, Wilf, and friends, combining everyday school life with imaginative journeys sparked by the magic key.

The story begins at school, where Biff, Chip, and Kipper bring a small model house. Things take a comical turn when Wilf climbs on Mrs. May's desk and accidentally drops books onto the model, smashing its roof. Suddenly, the magic key begins to glow—transporting the children to a Victorian-era house with a similarly broken roof. They meet three other children playing outside and presumably help fix the roof.