Grit Leads to Greatness - Single Book

Imagine a world that has forgotten how to build...

Adventurous siblings Tegan and Trig live in a decaying dystopian society that has been hypnotized by mysterious glowing stones.
After a devastating earthquake causes the city to teeter on the edge of a cliff, the duo embark on an epic journey to a place called Greatness, believing it holds the key to saving their city from disaster.
Obstacles continually block their path, but the kids, fortunately, befriend fanciful creatures who teach them important trade skills as they weave their way through a treacherous land.
Will the children have the GRIT to face their challenges, find Greatness AND figure out a way to change their world?