This documentary tells the story of the creation and cultural impact of the world's most famous Christmas carol, composed in 1818 in Salzburg, Austria, and since then translated into about 140 languages. In fact, the song Silent Night caused a Christmas ceasefire in World War I. Over the last 100 years the song has been translated into 140 languages including Bing Crosby's version which is the third best-selling single of all time.