Yorkshire, 1874. Penniless following the death of her husband, Annie Quaintain (Jessica Raine) and her two children are turfed out of their village home and forced to start a new life in Jericho. Jericho is home to a vibrant community of navvies and pioneers, prostitutes and vagabonds who will live and die in the shadow of the viaduct they've been brought together to build. Without a penny to her name, Annie reluctantly accepts the help of the railway agent Ralph Coates (Clarke Peters) and quickly sets herself up in a rented hut, offering board and lodging to the site's navvies - including one Johnny Jackson (Hans Matheson). Rough and rustic, it's a place where people with secrets can hide, and where love can flourish against all odds. Set against a visually striking frontier landscape, the series follows the creation of a community from nothing and the human stories and heroic struggles of survival that emerge.