Mary and Tom are parentless Irish siblings who arrive in New York City via ocean liner in 1886 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. Fuelled by curiosity, friendship, and teamwork, their dangerous and discovery-filled journey will introduce them to devious villains, surprising allies, unexpected heroes, and unimaginable adventures on a hilarious and heart-warming search for home.