The first book in an exciting new time-travel adventure series from New York Times bestselling author Krystal Sutherland, writing with Martin Seneviratne. Twelve-year-old twins Pearl and Patrick are definitely not ordinary children. Pearl, the engineering whizz, has invented a time machine, and Patrick, who has encyclopaedic knowledge of all human history, is the perfect person to test it out with her. They can't wait to find out what life was really like in Ancient Egypt, Greece and Rome! But when their time-travelling escapades threaten to break the world as we know it, it's the legends their dad has always told them about their homeland, Sri Lanka, that might just help them win an epic battle that could change past, present and future. Jump in for a funny, thrilling time-travel adventure - who knows what will happen when!