On a toxic planet, humans live in floating cities, relying on the strength and courage of the Riders for survival. Subria is going to be one of the few, a Rider dedicated to scouting the food and resources her people need to survive, but first she has to pass the entrance exam. Of course, it's more than just an exam, it's a chance to attain the one thing that a Rider needs above all others; a steed. The bond between these genetically engineered companions and their Riders is legendary, and Subria wants it almost as much as she wants to follow in her father's footsteps as a Rider. Legends might be all she ever gets to know it as though, because as soon as the test starts, something goes terribly, terribly wrong. Now, Subria's no longer fighting for a dream, she's in a battle for survival.