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 not ordinary school children. Pearl, the engineering whizz, has invented a time machine, and Patrick, who knows everything about every historical period, is the perfect person to test it out with her. The one thing the twins are not interested in is their dad going on and on about the legends from their homeland, Sri Lanka. But when their time-travelling gets them noticed by secret agency...