Ava is your typical teenage girl, hoping to spend her summer doing the usual: shopping, concerts, skateboarding, and hanging out with her friends. Her best friend Sera has other plans for them, learning how fly her uncle Mat's hot air balloon. Their first solo flight turns out to be the adventure of a lifetime. By magical forces, they are pulled into a world that is unlike their own: the world of Indigo, steeped in myths, legends, and prophecy. Where nothing is what it seems, and where good and evil are not easily distinguished. Will the two teens be able to figure out whose side they are really on before it's too late and find their way home?