11 year-old Echo Quickthorn has grown up believing that nothing exists outside the Kingdom of Lockfort, but everything changes when an eccentric professor parks his airship outside her window armed with a map that shows all the magical places that exist beyond the city walls.

Together with her pet lizard, Gilbert, Echo sets off on an incredible adventure to find her missing mother; an adventure that will take her to unimaginable places filled with giant butterflies, mechanical dragons and . . . sky pirates.