Documentary exploring the meaning and history of cool through the American music of the 1940s and 50s that became known as cool jazz. Those who wrote and played it cultivated an attitude, a style and a language that came to epitomise the meaning of a word that is now so liberally used. The film tells the story of a movement that started in the bars and clubs of New York and Los Angeles and swept across the world, introducing the key players and setting them in the context of the post-war world.