Worlds Unseen. The Seventh World Trilogy, #1

The Council for Exploration Into Worlds Unseen believed there was more to reality than the Empire had taught them-but when they came a little too close to the truth, tragedy ended their work, leaving the terrifying and beautiful world behind their own still hidden. As he lays dying forty years later, one of the last Council members entrusts an ancient relic to an orphaned young woman named Maggie Sheffield: a scroll that will reveal the truth at last.
Along with the Gypsy Nicolas Fisher, who hears things no one else can, Maggie sets out on a journey across the Seventh World to deliver the scroll to a group of rebels in the east. But the price of truth may be too high: for Maggie and Nicolas are tearing at the Veil between the seen and the unseen, between good and evil, between forgotten past and treacherous future. Monstrous forces are already on their trail. And when the Veil grows thin enough, it's anyone's guess what may come through. Worlds Unseen is the first book in The Seventh World Trilogy.