Amid the backdrop of the 1820s, 'Mountain Sunday' tells the story of a family fleeing from Ireland to Canada, seeking freedom under borrowed names. Their pursuit of liberation takes them across the vast expanse of the New World, traversing forests, prairies, and rugged mountains, where they encounter both friends and foes. As they brave the untamed wilderness, their journey unfolds into a tale that weaves together themes of faith, love, and family.