Twelve-year-old Lens' parents have gone missing in their search for a lost city. The Noland kids, Caleb, David and Lizzy, now eight years older since their last adventure, suspend their missions trip in the Congo to help find them. But dangers lurk around every corner and the quest seems doomed from the start. With incredible odds stacked against them and an unexpected enemy endangering their search, the Noland kids must uncover the dusty clues to this ancient city and discover its long lost light in order to rescue Lens' parents...and themselves!