Historian Dan Snow, naturalist Steve Backshall and wildlife enthusiast Kate Humble set out to solve some of the mysteries of St Kilda in Scotland's Outer Hebrides - the only British World Heritage Site nominated for both its extraordinary history and its wildlife.
Inhabited just 80 years ago St Kilda is now home to seabirds and seals, but these islands remain a place of mystery. When the St Kildans suddenly abandoned their homes, they left behind a place full of secrets and Dan, Steve and Kate travel to these far-flung islands to find out just who were the strange and remarkable people, why did they leave, and whether St Kilda's amazing wildlife can survive in the modern world.
Steve collects food the St Kildan way by abseiling down a 400-foot cliff, Kate finds out how this season's baby puffins are getting on and Dan discovers the islands' Viking history. But when Steve and Dan set out to row to the island of Boreray, all does not go to plan.