We encounter Carpenter and Faulkner, two agents of a forbidden river-god, as they make their way upwater in search of miracles and other members of their scattered faith.
As Carpenter and Faulkner attempt to track down a hidden church, Carpenter dwells on the miracle of the fishing boat and its meaning - while Faulkner reflects on his childhood.
Elsewhere on the Peninsula, Investigating Officer Hayward checks out a tip regarding a nearly-derelict farm, and a set of curious deaths that may be linked to religious activity.
Carpenter attempts to locate the Trawler-Man's church in the woods of Penda's Slake - but runs into trouble instead.
Faulkner takes the initiative, and learns the location of a fellow member of the faith in the process. Carpenter, recovering from her injuries, makes a new acquaintance.
We learn more about the origins of the Trawler-man's faith, as well as the upbringing of our protagonists.
Across the border, a young advertising executive finds herself at odds with her company's new direction.
Paige, Faulkner and Carpenter investigate the home of a suspected fellow worshipper - and find more than they bargained for.
As Hayward deals with the aftermath of Marcel's Crossing, he finds his investigation leading him heading northwards - with a new partner on his side.
Carpenter, Paige and Faulkner find refuge for the night in an abandoned call centre - but they're not alone there. Something is looking for them...
As Faulkner's injuries worsen, Carpenter and Paige take him to seek help. Will he survive this quest?
As the town of Bellwethers draws near and the police chase draws in, Carpenter, Faulkner and Paige make an unexpected stop for breakfast.
Carpenter and Faulkner arrive at Bellwethers - and witness the miracle of the Wither Mark.
As a new God of Sleep wreaks havoc across the Peninsula, Faulkner comes to a crossroads. Carpenter and Hayward have a frank exchange.
Season finale: with the police manhunt closing in, Carpenter and Faulkner have one final meeting at the river's edge.