The first ever full-length film about Gustav Holst, composer and revolutionary - a man who taught himself Sanskrit; lived in a street of brothels in Algiers; cycled into the Sahara Desert; allied himself during the First World War with a 'red priest' who pinned on the door of his church 'prayers at noon for the victims of Imperial Aggression'; hated the words used to his most famous tune, I Vow to Thee My Country, because it was the opposite of what he believed; and distributed a newspaper called the Socialist Worker. Holst's music - especially the Planets - owed little or nothing to anyone, least of all the English folk song tradition, but he was a great composer who died of cancer, broken and disillusioned, before he was 60.