Setting out to explore the River Colne, Jo and Cathy start at its source on the edge of the moors and journey downstream through urban West Yorkshire to its confluence with the River Calder. Their trip takes in weirs, walls, abandoned mills, industrial pollution, combined sewer overflows, liminal space and river life. As well as exploring the historical and present day human impacts on the river, they begin to question more deeply our relationship with rivers and the role they can play in our lives.