The number of zeroes on the Babel Corporation's contract has Emmett Atwater boarding their lightship and hoping to return to Earth with enough money to take care of his family-- forever. But it turns out he's one of ten recruits, all of whom have troubled pasts and are a long way from home. Now each recruit must earn the right to travel down to the planet of Eden-- a planet that Babel has kept hidden. There they will mine a substance called Nyxia...

"Every year since the Ashlords were gifted phoenix horses by their gods, they've raced them. First into battle, then on great hunts, and finally for the pure sport of seeing who rode the fastest. Centuries of blood and fire carved their competition into a more modern spectacle: The Races. Over the course of a multi-day event, elite riders from clashing cultures vie to be crowned champion. But the modern version of the sport requires more than good...

Sixteen-year-old Emmett Atwater is on a mining crew to harvest nyxia--the most valuable material in the galaxy--from Eden in order to gain enough money to live comfortably back on Earth. He soon learns, however, the the mining company Babel is only interested in profits at the expense of his life and those of his crew. Making things worse, Babel goes to war with Eden's indigenous people and Emmett is caught in the crossfire.

Rather than rest after saving Fable, Indira must begin a teamwork tutorial that leads to a quest filled with dragons, unlikely allies, and threats to all of Imaginary.