Fact-based drama about a retired detective and an Oxford professor and their investigation into the sewage scandal. The story also follows surfer Reuben, who believes his chronic illness, Meniere's disease, is a result of surfing in polluted water.

Continuing the fact-based drama about retired detective Ash Smith and Oxford professor Peter Hammond and their 10-year investigation into the sewage scandal. The drama also follows the Preen family, who went in search of answers after their eight-year-old daughter died after playing on a beach where a nearby pipe had been discharging.

When retired detective Ash Smith and Oxford professor Peter Hammond notice the water in their local river has turned brown, they begin to ask questions, leading to the start of a 10-year investigation.