With the widest catchment area of any river in Britain, the Tay drains much of the lower Highlands of Scotland. A vast network of lochs and smaller bodies of water feed the Isla, Garry, Tummel, Almond and Earn, which all flow into this mighty river. As Robin Crawford walks along the banks of the Tay, we delve into the history of this landscape and his personal connection with it, from hill walks with friends into the mountains of the Tay's source to his student days in Dundee, where the Tay eventually spills out into the North Sea. Along the route we dip into the river's story: the gold-panners on the river Cononish, the Earthquake House outside Comrie, Beatrix Potter's holiday home near Dunkeld. Throughout, the river is our constant companion, connecting the small moments on which events turn and lives are changed forever.