From the Staffordshire hills to the Humber estuary, spirited explorer Tom Fort embarks on a 170-mile journey down Britain's third longest river, the Trent. Beginning on foot, he soon transfers to his own custom-built punt, the Trent Otter, and rows many miles downstream. Along the way he encounters the power stations that generate much of the nation's electricity, veterans of the catastrophic floods of 1947, the 19th-century brewers of Burton and a Bronze Age boatman who once made a life along the river.