Susanna Davidson 
Under The Ground 

Lenny and Lola journey deep into the earth, encountering rabbits snuggled in their burrows, underground trains and dinosaur bones. They keep digging and digging until they pop out on the other side of the world! Part of the Usborne Reading Programme developed with reading experts at the University of Roehampton, specially written for children just starting to read alone. This ebook includes audio and reading-related puzzles. "Crack reading and make confident and enthusiastic readers with this fantastic reading programme." – Julia Eccleshare