Cambridge Discovery Education Interactive Readers are the next generation of graded readers - captivating topics, high-impact video, and interactive exercises designed to motivate and engage. In 1937, pilot Amelia Earhart set out to fly around the world. She never returned. Can this timeless mystery be solved? Use the unique code inside the book to access the online reader, complete with videos and interactive exercises. Word count: 1427. Lexile Reading Level: 540L