Roald Dahl flew planes in the Second World War (1939-1945) when Germany, Italy and Japan fought against Britain, France, Poland, other European countries, the USSR and the United States of America. Going Solo is Dahl's time with the RAF (Royal Air Force). He writes "I did not need to leave out anything here because every moment was, to me, totally interesting." Penguin Readers is a series of popular classics, exciting contemporary fiction, and thought-provoking non-fiction, written for learners of English as a foreign language. The series is aligned to the Common European Framework and includes language activities that help develop key skills. Going Solo, a Level 4 Reader, is A2+ in the CEFR framework. The text is made up of sentences with up to three clauses, introducing more complex uses of present perfect simple, passives, phrasal verbs and simple relative clauses. It is well supported by illustrations, which appear regularly.