Ella Day, the first princess of a mirror Earth known as Biack, is struggling to deal with mounting pressures while living in the spotlight. Jessica Durand, a teenage girl on Earth, has felt out of place her whole life and sought comfort in her regular dreams of Ella's life. But when Jess's life falls apart around her, she ends up trapped on Biack - a world that she isn't ready to accept as real - only to discover this world isn't ready to accept that she's real either...