Uncover the secret world of spies - who they are, what they do, and how they do it. Stunning photographs combine with lively illustrations and engaging, age-appropriate stories in this multi-level reading programme guaranteed to capture children's interest while developing their reading skills and general knowledge.Reading AloneMore complex sentence structure Information boxes and alphabetical glossary A choice of wide ranging subjects, including popular historical figures and natural history 2,000 - 3,000 words per book