Loch Hourn on the Knoydart peninsula in the Western Isles of Scotland is one of the last wildernesses of Europe. Access to sea lochs is difficult. Salt water mingles with fresh water as it runs off the mountains, icy even in high summer. This mesmeric film immerses us in the physicality of cold water swimming, asking why we put ourselves in the path of discomfort and risk; why does the search for adventure take us to ever more remote and inhospitable places? Join the originators of the UK’s Outdoor Swimming Society, ‘swim twins’ Kate Rew and Kari Furre, as they set out to chase the sublime.