The team returns to visit more locations around the nation's shoreline, beginning by exploring a diverse range of invasions. Nick Crane heads to the Channel Islands to learn about the German occupation of Guernsey during the Second World War, while Tessa Dunlop visits Norfolk to hear stories of a little-known Zeppelin bombing campaign on Britain during the Great War. Ruth Goodman goes to the Isle of Man to find out how it became the home of the TT motorcycle race, which attracts around 10,000 bikers from around the world each year, and Andy Torbet encounters a colony of water voles on a rocky outcrop in the seas off western Scotland.