Monsterville is a village inhabited by monsters that have grown tired of living among humans. But one day, Hanna manages to break into her world by putting Monsterville at risk. After the initial fright, the monsters will have to fight against worse enemies: Gargoyle and Cyclops, two monsters that will want to use Hanna to permanently close any contact with the outside world ... running the risk of Hanna being trapped forever in Monsterville.

In 1886, orphaned Irish siblings Mary and Tom arrive in New York City via ocean liner, and quickly find themselves on a wild, cross-country journey aboard a transcontinental 'Orphan Train', where they meet an extraordinary new friend who will change their lives forever.