Ndola, Northern Rhodesia (currently Zambia), September 18, 1961. Swedish economist and diplomat Dag Hammarskjöld, Secretary General of the UN, dies mysteriously in a plane crash. Decades later, Danish journalist and filmmaker Mads Brügger and Swedish researcher Göran Björkdahl investigate the case in search of definitive closure.

1961 - the year when Swedish UN soldiers are in the crisis-ridden Congo and Secretary General Dag Hammarskjöld dies in a plane crash. Swedish film's biggest hit, "Are there angels?", has its premiere with Christina Schollin in one of the roles. Yuri Gagarin becomes the first man in space and the Volvo P 1800 appears on the roads. Ewy Rosqvist is a rally ace and in April the regal ship Vasa is lifted up after 333 years at the bottom of Stockholm's stream. In August, the Berlin Wall is built and outside the Stockholm archipelago, Radio Nord broadcasts music and news.