How the secret 'Shetland Bus' helped Norway during WW2

It sounds like it could be the plot of a spy novel, but the 'Shetland Bus' was a real undercover operation carried out to help the resistance in Nazi-occupied Norway during World War Two. In the depths of winter and under the cover of darkness, convoys of small fishing boats left the safety of Scotland's most northerly islands to deliver valuable cargo and special agents to coves and fishing ports 200 miles away along the coast of Norway. On the perilous return journeys, refugees fleeing the occupation were hidden in...