Book excerpt: Penguin Readers is an ELT graded reader series for learners of English as a foreign language. Each title includes carefully adapted text, new illustrations and language learning exercises. The eBook edition does not include access to additional online resources. Titles include popular classics, exciting contemporary fiction, and thought-provoking non-fiction, introducing language learners to bestselling authors and compelling content. The eight levels of Penguin Readers follow the Common European Framework of Reference for language learning (CEFR). Exercises at the back of each Reader help language learners to practise grammar, vocabulary, and key exam skills. Before, during and after-reading questions test readers' story comprehension and develop vocabulary. Visit the Penguin Readers website Exclusively with the print edition, readers can unlock online resources including a digital book, audio edition, lesson plans and answer keys. It is May 1940. Western countries are falling into Nazi hands. Britain must prepare to be invaded any day. The future of the world lies on the shoulders of one man. This is the story of how British Prime Minister Winston Churchill changed history over twenty-five difficult days during World War II.