The documentary describes how rivers such as the Wensum were useful in powering mills - for example, Fakenham Mill transformed the surrounding area into a thriving market town. The film focuses on seasonal changes in plants and wildlife as well as historic landmarks such as Raynham Hall, Belaugh Hall and Senowe Park. It explores the river as a resource showing the processing of sand, gravel and stone, its value to people for leisure and as a source of drinking water.