Abandoned at Chipchase's Travelling Circus as a baby, Louie dreams of becoming a 'Showstopper', a tightrope walker – the Girl Who Walked on Air – she just needs to be given a chance. And the circus needs her too – Wellbeloved's rival show is stealing their crowds. Reluctantly Mr Chipchase lets Louie perform. She is a sensation, and gets an offer from the sinister Mr Wellbeloved to perform ... over Niagara Falls. Soon Louie's bravery is tested not just on the highwire but in confronting her past and the shady characters in the world of the circus ...
